SOLUTION: Please solve the following by factors (Please do not use the quadratic formula) 9x squared -9x-28=0

SOLUTION: Please solve the following by factors (Please do not use the quadratic formula) 9x squared -9x-28=0

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Question 360384: Please solve the following by factors (Please do not use the quadratic formula)

9x squared -9x-28=0
Answer by nerdybill(7384) (Show Source): You can put this solution on YOUR website!
9x squared -9x-28=0

.
Find some multiple of 'a' and 'c' that
multiplies to (9)(-28) and combines to -9:
9*28
3*3*2*2*7
(-21)(12)
.
Rewrite the middle term:

Group terms:

Factor:

x ={-4/3, 7/3}
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