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)

By keenly observing the given, we may group then as, (-7x³ + 21x²) and (3x -9). The first group may be factored by 7x²(-x + 3) and the second may be factored by -3(-x + 3). Combining the factors will give us an answer of (-x + 3)(7x² - 3). Similarly this equal to (3-7x²)(x - 3). Thus, the answer is the third choice.

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