Question

How to factorise this?

Answer 1

Answer:

b = 5 or - 1

Step-by-step explanation:

- 3b² + 12b + 15 =0

-3( b² -4b - 5) = 0

b² - 4b - 5 = 0

b² -5b + b - 5 =0

b(b - 5) + 1(b - 5) = 0

(b - 5) (b + 1) = 0

b - 5 = 0 or b + 1 =0

b = 5 or -1

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