Algebra for Math 108
In Math 108, we will assume that you can handle the
algebra of first and second degree polynomials with no problems
and without a calculator (except to decimalize your answers ). Here are examples
of what we will assume you can
do. Do not ask yourself “Did I see this stuff before?” Instead ask “Can I work
these problems right now?” If you are
not sure how to solve those problems right now, review the book’s first chapter
ASAP, or enroll in Math 103 before
taking this course.
1) Solve 17x+25 = 16.
2) Use factoring or the quadratic formula
to solve quadratic equations such as 3x2+7x = 2 and x2+x =
6. You will be expected to have the quadratic formula
in your memory, and know how to use it.
3) Solve the system of equations
3x+4y = 6
x+y2 = 7.
4) Consider the curve y = x2+x. For which
point(s) (x,y) on the graph of that curve will x = 5? For which point(s)
on the graph of that curve will y = 6?
5) What is the shape of the graph of y = x2−5x+7? of x2+y2
= 9? of y = 1/x
?
6) Why is 
7) If f (x) = x2+3x, what is f (5+h)?
8) Where does the curve 
cross the x-axis?
**********
Solutions:
1) x = − 9/17
2) The solutions of the first quadratic equation are approximately x =
-2.590667291 and x = 0.2573339576.
The solutions of the second equation are exactly x = −3 and x = 2.
3) The solutions are 
and x = −2,y = 3.
4) (5,30); (2,6)(−3,6)
5) parabola opening upward, circle with center at origin and radius 3, hyperbola
6) You cannot cancel that way. Instead
7) 40+13h+h2.
8) at x = 0 and x = 1/2
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