Which of the binomials below is a factor of this trinomial? 4x^2+20x-24 A) x-1 B) x-4 C) x+4 D) x+1

asked Feb 21, 2019 85.0k views

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Which of the binomials below is a factor of this trinomial?

4x^2+20x-24

A) x-1
B) x-4
C) x+4
D) x+1

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2 votes

Answer: A. x-1

Explanation:

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$4x^2+20x-24=4(x^2+5x-6)=4(x^2+6x-x-6)\\\\=4[x(x+6)-1(x+6)]=4(x+6)(x-1)\\\\Answer:\ A)\ x-1$

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