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Marina CMI [18]
3 years ago
11

Factor x3 – 4x2 + 7x – 28 by grouping. What is the resulting expression?

Mathematics
2 answers:
kirill [66]3 years ago
8 0

Consider polynomial x^3 - 4x^2 + 7x - 28. You can group first two terms and last two terms:

x^3 - 4x^2 + 7x - 28=(x^3 - 4x^2) + (7x - 28).

In first brackets the common factor is x^2 and in second brackets the common factor is 7, then

x^3 - 4x^2 + 7x - 28=(x^3 - 4x^2) + (7x - 28)=x^2(x-4)+7(x-4)=(x-4)(x^2+7).

Answer: the correct answer is D.

Luba_88 [7]3 years ago
4 0
X^3 -4x^2 +7x -28 = x^2(x-4) +7(x -4) = (x^2 +7)(x-4)

so the 4th choice will be right sure 
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