SOLUTION: Solve... 1.x^2=12 2.x^2-80=0 3.x^2+5=21 4.9x^2=14 5.(x-4)^2=3 6.(x+4)^2=4 7.5(x-2)^2=3 8.-9(x-3)^2=-7

Algebra ->  Quadratic Equations and Parabolas  -> Quadratic Equations Lessons  -> Quadratic Equation Lesson -> SOLUTION: Solve... 1.x^2=12 2.x^2-80=0 3.x^2+5=21 4.9x^2=14 5.(x-4)^2=3 6.(x+4)^2=4 7.5(x-2)^2=3 8.-9(x-3)^2=-7      Log On


   

Question 86039: Solve...
1.x^2=12
2.x^2-80=0
3.x^2+5=21
4.9x^2=14
5.(x-4)^2=3
6.(x+4)^2=4
7.5(x-2)^2=3
8.-9(x-3)^2=-7
Answer by checkley75(3666) About Me  (Show Source):
You can put this solution on YOUR website!
1. X^2=12, X=SQRT12, X=3.463
2. X^2-80=0, X^2=80, X=SQRT80, X=8.944
3. X^2+5=21, X^2=21-5, X^2=16, X=SQRT16, X=4
4. 9X^2=14, X^2=14/9, X=SQRT14/9, X=SQRT1.5566, X=1.247
5. (X-4)^2=3, X^2-8X+16=3, X^2-8X+16-3=0, X^2-8X+13 USING THE QUADRATIC EQUATION
x+=+%28-b+%2B-+sqrt%28+b%5E2-4%2Aa%2Ac+%29%29%2F%282%2Aa%29+ WE GET:
X=(8+-SQRT[-8^2-4*1*13])/2*1
X=(8+-SQRT[64-52})/2
X=(8+-SQRT12)/2
X=(8+-3.464)/2
X=(8+3.464)/2
X=11.464/2
X=5.732 ANSWER.
X=(8-3.464)/2
X=4.536/2
X=2.268 ANSWER.
I'LL LEAVE THE REST FOR YOU TO SOLVE.