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28-10-2020
Mathematics

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Which of the binomials below is a factor of this trinomial?
3x2 + 18x-21
O A. X-3
O
B. X-1
O c. x+1
O D. X+ 3
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28-10-2020

Answer:

B. X-1

Step-by-step explanation:

[tex]3x^2 + 18x-21[/tex]

Factor out common term : 3

[tex]=3\left(x^2+6x-7\right)\\\\Factor\: : x^2+6x-7\right \\\\=3\left(x-1\right)\left(x+7\right)[/tex]

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