# Quadratic Formula

**1. Use the quadratic formula to solve quadratic
equations.
For equations in the form ** ax

^{2}+ bx + c = 0 ,

**the quadratic formula is:**

**(Memorize)**

*Be careful when c is
negative , −4(5)(−2) = +40

** ( simplify ** **
)**

** (You must be able to
divide both pieces on the top to reduce the fraction.)**

** (simplify
)**

**(simplify:
)**

**(simplify:)**

**Since there is no radical left , you must write two
equations and solve.**

**2. Solve using your choice of methods.
(a) If there is x ^{2} , but not x^{1}**

**term , use the square root method. OR if there is**

( )

*Remember to always put ± . Never take the square root of ax

must divide by a first .

(b) Factor if possible .

(c) Use the formula .

( )

^{2}*Remember to always put ± . Never take the square root of ax

^{2}, butmust divide by a first .

(b) Factor if possible .

(c) Use the formula .

***Remember to never
.Divide by 2 first.**

**Since there is no radical left, you must write two
equations and solve.**

** Remember to factor any
denominators first .**

**You must list restrictions anytime there is a letter in
the denominators.**

**Restrictions:**

** Multiply each term by the common denominator ( x − 3)( x −
4) .**

**Assignment: 1.5 page 144, 65 – 73 odd, 83 – 107 odd
**

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