help me please!

Question

0

500

1

b^3 - 4b^2 - 21b = 0

Guest Dec 10, 2018

+37158

0

Best Answer

b^3 - 4b^2 - 21b = 0 Factor out 'b'

b (b^2-4b-21) = 0 factor

b (b-7)(b+3) = 0

for this to = 0 either ( b = 0) or b-7 = 0 (b=7) or b+3 = 0 (b=-3)

ElectricPavlov · Answer 1 · 2018-12-10T04:07:24

b^3 - 4b^2 - 21b = 0 Factor out 'b'

b (b^2-4b-21) = 0 factor

b (b-7)(b+3) = 0

for this to = 0 either ( b = 0) or b-7 = 0 (b=7) or b+3 = 0 (b=-3)