Question

Factor –7x3 + 21x2 + 3x – 9 by grouping. What is the resulting expression?

(3 – 7x)(x2 – 3)
(7x – 3)(3 + x2)
(3 – 7x2)(x – 3)
(7x2 – 3)(3 + x)

Answer 1

Answer:

$( - 21) + 42 - 9 + 3x \\ 12 + 3x \\ 3(4 + x)$

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