Posted by Hannah on Thursday, September 9, 2010 at 5:08pm.
Factor completely. If the polynomial cannot be factored say it is prime.
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)(2x6)
C) 2(x7)(x3)
D) (x7)(x3)
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 6:16pm
1. Why don't you expand A) and see what you get?
2.
2x^2  14x  6x + 42
= 2x(x7)  6(x7)
= (x7)(2x6)
= 2(x7)(x3)

Math(Please check answers)  Dennis, Thursday, June 4, 2015 at 12:21pm
Just like what Reiny said, just try and expand it yourself. See what you can find! :)
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