 # Review topics for final exam

2.1 – one variable linear equations

solve equations (isolate x)
including those with fractions or decimals

2.5 – one variable linear inequalities

solve inequalities (isolate x; remember when to flip the symbol)
including those with fractions or decimals

2.6 – set operations - union, intersection

find intersection ( ∩ or “and”) of two sets
find union (∪  or “or”) of two sets
solve compound inequalities (with “and” or “or”)

3.1 - rectangular coordinate system (x-y plane)

plot ordered pairs
graph any equation by using an x-y table
find x- and y- intercepts (from a graph or from an equation)
midpoint*

3.2 and 3.3 – graphs of linear equations

find slope from 2 points (given the graph or just ordered pairs)
don’t forget slopes for horizontal and vertical
graph lines
given the slope and any point on the line
given an equation
use different forms of linear equations - slope-intercept, point-slope
what important values are in these?
how/when do you use each?
horizontal lines (y = some #)
vertical lines (x = some #)
find equations of parallel & perpendicular lines and their slopes
given a graph, use one of the linear forms to write an equation of the line
remember for word problems: y = mx+b
m = rate of change (increase)
b = initial/starting value

3.4 – 2 variable linear inequalities

graph these inequalities
dashed or solid line?
shade up or down? left or right?
graph compound inequalities
same thing, but what part gets shaded by BOTH inequalities?

3.5 – relations and functions

different forms of relations
mapping diagram
set of ordered pairs
equation
graph
find domain and range of relations (from looking at any of the above forms)
from a graph: look left to right for domain; look bottom to top for range
definition of a function
decide if a relation is a function
if you see a graph -> use vertical line test
given a function, find the value of the function at a particular input
graph linear functions (just like linear equations, remember y = f(x)

5.5 Divide Polynomials

Divide by one term (monomial): divide each term on top one at a time (try to cancel factors)
Divide by more than one term (polynomial):
Like long division
Remember what to do if you’re “missing” a term

6.1 – 6.3 Factoring Expressions

Take out a common factor from each term
Trinomials
Difference of squares (NOT sum): Difference of cubes: Sum of cubes : 6.5 Solving Equations by Factoring (shows up at the end of other problems too)
As soon as you seex2 and x :
Move every term to one side of the equation
Factor (using techniques from 6.1 – 6.3, depending on the problem)
Set each factor = 0, then solve each equation

7.1 Rational (fractional) Expressions

Find domain (remember denominator ≠0; set notation)
Write in lowest terms (factor, then try to cancel)
Multiply (straight across)
Divide (leave the first fraction alone, but multiply by the reciprocal of the second fraction)

Need common denominator
Remember how to find LCD, then rewrite each fraction using that LCD
Add or subtract the numerators, keep the same denominator

7.3 Complex Fractions (fractions inside of fractions)
Remember what negative exponents mean (example : )
Simplify using one of two methods (I think the second is easier)
Method 1: simplify the numerator, simplify the denom.,
then multiply the numerator by the reciprocal of the denominator
Method 2: multiply by (you want to get rid of all of the little fractions), then simplify

7.4 Solving Rational Equations

1. Check the domain of x to know what solutions you have to eliminate
2. multiply both sides of equation by LCD (you want to get rid of fractions)
3. simplify, and solve for x
4. if any one of your solutions is not in the domain of x (check 1st step), then throw it out

7.5 Applications

Take a formula, and solve for one of the variables
Use proportions
Problems with distance, rate, and time

5.1 Integer Exponents

Product Rule
Quotient Rule
Power Rules (3 different ones)
Negative exponents
a0=1(for any a)
Scientific Notation

Find roots
Graph radical functions (set up x-y table, plug in x’s, then use calculator to help find y’s) may help to find a root using your calculator (or for different problems in 8.2)

8.2 Rational Exponents

Remember the rule: to START simplifying expressions
Use it to write exponentials as radicals
Use it also to write radicals as exponentials

Product Rule

Quotient Rule

2. no radicals inside a denominator
3. the index and any exponents in the radicand must have no common factor greater than 1
4. the radicand must have no factor raised to a power ≥ the index

When fractions are involved, try to simplify each fraction FIRST, then add/subt. using the LCD

FOIL binomials
To “divide” - rationalize the denominator
When the denominator is a binomial, multiply the numerator and denom. by the conjugate.

Step 1:

Step 2: Use the power rule

Step 3: Solve the new equation

Step 4: Check EVERY possible solution in ORIGINAL equation

8.7 Complex Numbers

Use i to multiply, divide, and simplify radical expressions

Add/subtract complex numbers (combine like terms)

Multiply complex numbers (FOIL)

“Divide” complex numbers (use complex conjugate to get i out of the denominator)

9.1 and 9.2 Solving Quadratic Equations (if you can’t/don’t want to factor)

Sq. root property: As soon as you see x2 an term or (but NO plain terms):
Isolate the squared part
Take the square root of both sides (remember ±)
If you’re not done already, solve for x
As soon as you see an x2 term AND an x term:
Move every term to one side of the equation (need: )
If you can’t/don’t want to factor – complete the square OR use quadratic formula
To complete the square:
1. If a≠1, divide every term by .
2. Move constant to the other side.
3. Take ½ of the number in front of x (remember you’ll use this answer later),

then square it.

5. Factor the trinomial, but remember it should turn into

(x then that ½ answer from before.)2

6. Use sq. root property, and solve. Don’t forget, if you have a neg. INSIDE of a sq. root, that means you take it out and put on the OUTSIDE of the sq. root.

Solve formulas for a different variable (using the techniques above).

Solve word problems (using the techniques above; you may also need to use ).

9.5 and 9.6 Graphs of Quadratic Equations (Parabolas)

Remember how to graph (or really what it is/where it is on the coordinate plane).
Use that graph to shift up shift down shift left shift right or a combination of shifts.
Look at the a in or a>0 parabola opens up a<0: parabola opens down parabola is wider than  parabola is narrower than For Vertex : (h, k) y-intercept: plug in 0 for x, and solve

For Vertex: or y-intercept:(0, c)

Remember how to find domain and range from a graph

(domain of a parabola is always(−∞, ∞) , but you’ll have to think about range more).

4.1 Systems of Linear Equations

To check if a solution (x, y) is correct, plug into BOTH original equations
Solve any system by using substitution, elimination, or graphing
Know how to recognize when there is NO solution or when there is an infinite # of solutions

4.3 Applications of Systems of Equations

Step 2: define variables for what you don’t know (usually what you’re asked to find)
Step 3: write equations
Step 4: solve with substitution or elimination

Problems with cost:

Try to add up to a total # of items bought/sold
AND/OR