8x^2-5x-12=

Simple and best practice solution for 8x^2-5x-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 8x^2-5x-12= equation:


Simplifying
8x2 + -5x + -12 = 0

Reorder the terms:
-12 + -5x + 8x2 = 0

Solving
-12 + -5x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-1.5 + -0.625x + x2 = 0

Move the constant term to the right:

Add '1.5' to each side of the equation.
-1.5 + -0.625x + 1.5 + x2 = 0 + 1.5

Reorder the terms:
-1.5 + 1.5 + -0.625x + x2 = 0 + 1.5

Combine like terms: -1.5 + 1.5 = 0.0
0.0 + -0.625x + x2 = 0 + 1.5
-0.625x + x2 = 0 + 1.5

Combine like terms: 0 + 1.5 = 1.5
-0.625x + x2 = 1.5

The x term is -0.625x.  Take half its coefficient (-0.3125).
Square it (0.09765625) and add it to both sides.

Add '0.09765625' to each side of the equation.
-0.625x + 0.09765625 + x2 = 1.5 + 0.09765625

Reorder the terms:
0.09765625 + -0.625x + x2 = 1.5 + 0.09765625

Combine like terms: 1.5 + 0.09765625 = 1.59765625
0.09765625 + -0.625x + x2 = 1.59765625

Factor a perfect square on the left side:
(x + -0.3125)(x + -0.3125) = 1.59765625

Calculate the square root of the right side: 1.263984276

Break this problem into two subproblems by setting 
(x + -0.3125) equal to 1.263984276 and -1.263984276.

Subproblem 1

x + -0.3125 = 1.263984276 Simplifying x + -0.3125 = 1.263984276 Reorder the terms: -0.3125 + x = 1.263984276 Solving -0.3125 + x = 1.263984276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = 1.263984276 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = 1.263984276 + 0.3125 x = 1.263984276 + 0.3125 Combine like terms: 1.263984276 + 0.3125 = 1.576484276 x = 1.576484276 Simplifying x = 1.576484276

Subproblem 2

x + -0.3125 = -1.263984276 Simplifying x + -0.3125 = -1.263984276 Reorder the terms: -0.3125 + x = -1.263984276 Solving -0.3125 + x = -1.263984276 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.3125' to each side of the equation. -0.3125 + 0.3125 + x = -1.263984276 + 0.3125 Combine like terms: -0.3125 + 0.3125 = 0.0000 0.0000 + x = -1.263984276 + 0.3125 x = -1.263984276 + 0.3125 Combine like terms: -1.263984276 + 0.3125 = -0.951484276 x = -0.951484276 Simplifying x = -0.951484276

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.576484276, -0.951484276}

See similar equations:

| 2x-8=3x-10 | | 4(y-7)=2(y+41) | | 6-5(2a-3)=1 | | 0.44x=x-1 | | 4x^2+x+6=-7x+3 | | 8x^2-13x-12= | | 6b=a | | 7(y-2)+22=4y+32 | | 8+9y=7 | | 5(2b-1)-b= | | (3x+5)(2x-1)=0 | | 14=y+z | | -2(t-3)+4t=9t-1 | | -4x+8=-2x+17 | | x^2+6a+8=0 | | z+15=y | | 2-6u=-40 | | 5-3n=n-12 | | 7x+5=-7+5x+16 | | -8x-6(x-3)=18+7x | | 3x^2-3=5x-1 | | 3(x-6)+12=2(x-7) | | -7x-8=9x+24 | | -5(t-2)+8t=6t-3 | | (3xm)+(3xm)= | | 9x=66+3x | | 3(x-4)=7x-5-4x | | N^2-9n=0 | | -4=-14-3x | | 4x^2-4x+2=2x | | (x-2)(x+3)=14 | | 20=y-1 |

Equations solver categories