SOLUTION: Solve the quadratic equation 3(x-9)²=81

Algebra ->  Complex Numbers Imaginary Numbers Solvers and Lesson -> SOLUTION: Solve the quadratic equation 3(x-9)²=81      Log On


   

Question 163592: Solve the quadratic equation
3(x-9)²=81
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
3(x-9)²=81
3(x^2-18x+81)=81
3x^2-54x+243-81=0
3x^2-54x+162=0
3(x^2-18+54)=0
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+
x=(18+-sqrt[-18^2-4*1*54])/2*1
x=(18+-sqrt[324-216])/2
x=(18+-sqrt108)/2
x=(18+-10.3923)/2
x=(18+10.3923)/2
x=28.3923/2
x=14.196 Answer.
x=(18-10.3923)/2
x=7.6608/2
x=3.804 Answer.