Write the expression 5x(x + 9) − 7(x + 9) in complete factored form. A. (x + 9)(x + 9) B. (5x − 7)(x + 9) C. (5x − 7)(x + 9)(x + 9) D. (5x2 + 45x)(-7x − 63)

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Hanaan Rosenthal asked Apr 10, 2023

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Write the expression 5x(x + 9) − 7(x + 9) in complete factored form.

A.
(x + 9)(x + 9)
B.
(5x − 7)(x + 9)
C.
(5x − 7)(x + 9)(x + 9)
D.
(5x2 + 45x)(-7x − 63)

Mathematics
high-school

Hanaan Rosenthal asked Apr 10, 2023

by Hanaan Rosenthal

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B. (5x-7)(x+9)
This method of factoring is grouping. You could take (x+9) out of both the 5x and the -7, and the next step is putting the 5x -7 in its own set of parentheses.

Amalie answered Apr 16, 2023

by Amalie

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