0=x^2-8x-12

Simple and best practice solution for 0=x^2-8x-12 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 0=x^2-8x-12 equation:


Simplifying
0 = x2 + -8x + -12

Reorder the terms:
0 = -12 + -8x + x2

Solving
0 = -12 + -8x + x2

Solving for variable 'x'.

Combine like terms: 0 + 12 = 12
12 + 8x + -1x2 = -12 + -8x + x2 + 12 + 8x + -1x2

Reorder the terms:
12 + 8x + -1x2 = -12 + 12 + -8x + 8x + x2 + -1x2

Combine like terms: -12 + 12 = 0
12 + 8x + -1x2 = 0 + -8x + 8x + x2 + -1x2
12 + 8x + -1x2 = -8x + 8x + x2 + -1x2

Combine like terms: -8x + 8x = 0
12 + 8x + -1x2 = 0 + x2 + -1x2
12 + 8x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
12 + 8x + -1x2 = 0

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

Divide each side by '-1'.
-12 + -8x + x2 = 0

Move the constant term to the right:

Add '12' to each side of the equation.
-12 + -8x + 12 + x2 = 0 + 12

Reorder the terms:
-12 + 12 + -8x + x2 = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8x + x2 = 0 + 12
-8x + x2 = 0 + 12

Combine like terms: 0 + 12 = 12
-8x + x2 = 12

The x term is -8x.  Take half its coefficient (-4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
-8x + 16 + x2 = 12 + 16

Reorder the terms:
16 + -8x + x2 = 12 + 16

Combine like terms: 12 + 16 = 28
16 + -8x + x2 = 28

Factor a perfect square on the left side:
(x + -4)(x + -4) = 28

Calculate the square root of the right side: 5.291502622

Break this problem into two subproblems by setting 
(x + -4) equal to 5.291502622 and -5.291502622.

Subproblem 1

x + -4 = 5.291502622 Simplifying x + -4 = 5.291502622 Reorder the terms: -4 + x = 5.291502622 Solving -4 + x = 5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x = 5.291502622 + 4 x = 5.291502622 + 4 Combine like terms: 5.291502622 + 4 = 9.291502622 x = 9.291502622 Simplifying x = 9.291502622

Subproblem 2

x + -4 = -5.291502622 Simplifying x + -4 = -5.291502622 Reorder the terms: -4 + x = -5.291502622 Solving -4 + x = -5.291502622 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -5.291502622 + 4 Combine like terms: -4 + 4 = 0 0 + x = -5.291502622 + 4 x = -5.291502622 + 4 Combine like terms: -5.291502622 + 4 = -1.291502622 x = -1.291502622 Simplifying x = -1.291502622

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.291502622, -1.291502622}

See similar equations:

| 8525000*19.3=x | | 5(9a-9)= | | -5x+23=-3x+13 | | y+5(2)=8 | | 5x+7=13x | | x+5.3=8.2 | | y+5(0)=8 | | 4(x+1)-7x=6+5-2 | | T/4-7=-9 | | D=8/5(m-52) | | 1+4(X+5)=0 | | -8-12a+6b+7a-7-7b= | | 2=2-t/7 | | -(n-6)-8=-(1n) | | 4.2-1.8a=2.5a | | -1/9(9x-63y) | | 1/8(m-24)=5 | | 7y/2x=2 | | -4x+y=-25 | | (2/4)*(3/7) | | (3*x/2)=(20/4) | | Q=50-10p | | 2y-15=69+8y | | -5x-3(4)=11 | | h(x)=(1.4)x+5 | | (9x^5-x^2)/x | | 12y=21+3 | | -8y+6ab+7-3ba= | | x-(20-x)=4 | | y=tan(4/3)x | | 3x^2+7x-8=-10 | | 6kp+9k+pk-14= |

Equations solver categories