-x^2+12=9x

Simple and best practice solution for -x^2+12=9x equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for -x^2+12=9x equation:


Simplifying
-1x2 + 12 = 9x

Reorder the terms:
12 + -1x2 = 9x

Solving
12 + -1x2 = 9x

Solving for variable 'x'.

Reorder the terms:
12 + -9x + -1x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
12 + -9x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-12 + 9x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + 9x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + 9x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + 9x + x2 = 0 + 12
9x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
9x + x2 = 12

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 12 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 12 + 20.25

Combine like terms: 12 + 20.25 = 32.25
20.25 + 9x + x2 = 32.25

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 32.25

Calculate the square root of the right side: 5.678908346

Break this problem into two subproblems by setting 
(x + 4.5) equal to 5.678908346 and -5.678908346.

Subproblem 1

x + 4.5 = 5.678908346 Simplifying x + 4.5 = 5.678908346 Reorder the terms: 4.5 + x = 5.678908346 Solving 4.5 + x = 5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 5.678908346 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 5.678908346 + -4.5 x = 5.678908346 + -4.5 Combine like terms: 5.678908346 + -4.5 = 1.178908346 x = 1.178908346 Simplifying x = 1.178908346

Subproblem 2

x + 4.5 = -5.678908346 Simplifying x + 4.5 = -5.678908346 Reorder the terms: 4.5 + x = -5.678908346 Solving 4.5 + x = -5.678908346 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -5.678908346 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -5.678908346 + -4.5 x = -5.678908346 + -4.5 Combine like terms: -5.678908346 + -4.5 = -10.178908346 x = -10.178908346 Simplifying x = -10.178908346

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.178908346, -10.178908346}

See similar equations:

| (3y)(2y+7)=(6)(11) | | 5*9x=41 | | 2e-2=4(e+7) | | -7x-7x+8+5x+11=-2+81 | | -x+24=x+16 | | X+1=3+1 | | (3y)(2y+7)=(6+11) | | 39=-3r | | 2(-4m-5)+9m-12=0 | | -3x+4y=11 | | -2x+1-6x=7+18 | | 3=-3-15 | | 52=2(4y-2) | | 5d+2d-14d=-56 | | -3(x+2)(x+4)=0 | | -x+34=x+16 | | a+3a+2a=-1+3a+4 | | 5*4-8= | | (7)(t-1)=(4+t) | | x+(-8)=-70 | | -12=p+16 | | 27+k=30(1point) | | 36+5c=13c-4 | | 3(6+2b)+2+1b=25 | | 24=6d-18 | | 63+m=79 | | a*100*100*100=1 | | 17=-3(g+3)-g | | 4(y+3)=3y-6 | | -9g-18=27 | | -7(a+10)=-7a-69 | | 3x+2x=11x-4x |

Equations solver categories