Question

Factor: b2+3b−40
A. (b - 8)(b + 5)
B. (b + 10)(b - 4)
C. (b + 8)(b - 5)
D. (b - 5)(b - 8)

Answer 1

=b²+3b-40
=b²+8b-5b-40
=b(b+8)-5(b+8)
=(b-5)(b+8)

option C is correct

Answer 2

$b {}^{2} + 3b - 40$

$b {}^{2} + 8b - 5b - 40$

$b(b + 8) - 5(b + 8)$

$(b + 8)(b - 5)$

Option C

Thanks