Mackyle Mackyle

24-01-2018
Mathematics

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-3b^2+3b+90 how to factor

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24-01-2018

Factor the following:
-3 b^2 + 3 b + 90
Factor -3 out of -3 b^2 + 3 b + 90:
-3 (b^2 - b - 30)
The factors of -30 that sum to -1 are 5 and -6. So, b^2 - b - 30 = (b + 5) (b - 6):
Answer: -3(b + 5) (b - 6)

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