Question

Factor this fully

$4b^{2} +23b+15$

Answer 1

Answer:

4b^2 + 23b + 15 = 0

sum = 23

product = 60

nos. are 20 & 3

4b^2 + 20b + 3b + 15 = 0

4b(b + 5) + 3(b+5) = 0

(4b+3)(b+5) = 0

so now either (4b+3) = 0 or (b+5) = 0

thus, b = -3/4 or -5

hope it helps

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