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To evaluate a quantratic expression we use the quadratic formula below:
We assume the equation looks like this
ax2 +bx +c
The value of x is given by:
In our equation b2
+ 6b +9 can alos be written as
+ 6x +9
Filling the formula with the values gives
(-6 (+ or -) Square root of ( 62
- 4(1 *9))/2(1)
Solving the square root part
Square root of (36-36) is 0
-6 (+ or -) 0 all of it divided by 2 gives:
The value for b in the expression is -3
Notice how easy it was because the square root part gave us a zero.
if you want to know how the quadratic formula is arrived at, please look at the following tutorial:
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