Question 59663: When 16b2 + 10b - 21 is factored, one factor is:
4b - 7
8b + 7
2b - 3
16b + 3
none of these
Answer by funmath(2933)   (Show Source):
You can put this solution on YOUR website! When 16b^2 + 10b - 21 is factored, one factor is:
4b - 7
8b + 7
2b - 3
16b + 3
(none of these) <---answer
:
16b^2+10b-21 This is the ac method. a*c=16*-21=-336 replace b, (10) with two numbers that multiply to give you -336, but add to give you 10. I used the prime factors of 336 to find them.
16b^2+24b-14b-21
(16b^2+24b)+(-14b-21)
8b(2b+3)-7(2b+3)
(2b+3)(8b-7) <---Neither of these factors is a choice.
Happy Calculating!!!
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