Answer:
Step-by-step explanation:
x= -7 and x= 4, change sign when putting it in equation
(x+7) (x-4), then the the FOIL method ( first, outer, inner, last)
(x+7) (x-4), x² FIRST
(x+7) (x-4), -4x OUTER
(x+7) (x-4), 7x INNER
(x+7) (x-4), -28 LAST
= x²-4x +7x-28
x²+3x-28=0
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Answers & Comments
Answer:
A. x²+3x-28=0
Step-by-step explanation:
x= -7 and x= 4, change sign when putting it in equation
(x+7) (x-4), then the the FOIL method ( first, outer, inner, last)
(x+7) (x-4), x² FIRST
(x+7) (x-4), -4x OUTER
(x+7) (x-4), 7x INNER
(x+7) (x-4), -28 LAST
= x²-4x +7x-28
x²+3x-28=0