SOLUTION: solve: 18a^3-54a^2+36a

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Question 152820: solve:
18a^3-54a^2+36a


Answer by jojo14344(1513) About Me  (Show Source):
You can put this solution on YOUR website!
18a^3-54a^2+36a
Re: 18a%5E3-54a%5E2%2B36a=0. Divide the whole eqn by %2818a%29
%28cross%2818a%5E3%29a%5E2-cross%2854a%5E2%293a%2Bcross%2836a%292%29%2Fcross%2818a%29=0
a%5E2-3a%2B2=0
By Quadratic: A=1,B=-3, & C=2
a=%28-B%2B-sqrt%28B%5E2-4AC%29%29%2F%282A%29
a=%28-%28-3%29%2B-sqrt%28-3%5E2-4%2A1%2A2%29%29%2F%282%2A1%29
a=%283%2B-sqrt%289-8%29%29%2F2
a=%283%2B-sqrt%281%29%29%2F2
2 values:
a=%283%2Bsqrt%281%29%29%2F2=%283%2B1%29%2F2=4%2F2=2
a=%283-sqrt%281%29%29%2F2=%283-1%29%2F2=2%2F2=1
Thank you,
Jojo