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December 21, 2014

December 21, 2014

Posted by **Hannah** on Thursday, September 9, 2010 at 5:08pm.

1) 15x^3 + 19x^2 + 6x

A) (3x^2 +2)(5x+3)

B) x(3x+2)(5x+3)

C) x^2(3x+2)(5x+3)

D) x(5x+2)(3x+3)

E) Prime

I chose E) Prime.

2) 2x^2 - 14x - 6x + 42

A) 2(x+7)(x+3)

B) (x+7)(2x-6)

C) 2(x-7)(x-3)

D) (x-7)(x-3)

E) Prime

I know that this is 2x^2 - 20 + 42 when you combine the 14x and 6x so I chose answer E) Prime but I am not sure for this one.

- Math(Please check answers) -
**Reiny**, Thursday, September 9, 2010 at 6:16pm1. Why don't you expand A) and see what you get?

2.

2x^2 - 14x - 6x + 42

= 2x(x-7) - 6(x-7)

= (x-7)(2x-6)

= 2(x-7)(x-3)

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