5x^2-12x-8=0

Simple and best practice solution for 5x^2-12x-8=0 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 5x^2-12x-8=0 equation:


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

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

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

Solving for variable 'x'.

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

Divide each side by '5'.
-1.6 + -2.4x + x2 = 0

Move the constant term to the right:

Add '1.6' to each side of the equation.
-1.6 + -2.4x + 1.6 + x2 = 0 + 1.6

Reorder the terms:
-1.6 + 1.6 + -2.4x + x2 = 0 + 1.6

Combine like terms: -1.6 + 1.6 = 0.0
0.0 + -2.4x + x2 = 0 + 1.6
-2.4x + x2 = 0 + 1.6

Combine like terms: 0 + 1.6 = 1.6
-2.4x + x2 = 1.6

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 1.6 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 1.6 + 1.44

Combine like terms: 1.6 + 1.44 = 3.04
1.44 + -2.4x + x2 = 3.04

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 3.04

Calculate the square root of the right side: 1.743559577

Break this problem into two subproblems by setting 
(x + -1.2) equal to 1.743559577 and -1.743559577.

Subproblem 1

x + -1.2 = 1.743559577 Simplifying x + -1.2 = 1.743559577 Reorder the terms: -1.2 + x = 1.743559577 Solving -1.2 + x = 1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 1.743559577 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 1.743559577 + 1.2 x = 1.743559577 + 1.2 Combine like terms: 1.743559577 + 1.2 = 2.943559577 x = 2.943559577 Simplifying x = 2.943559577

Subproblem 2

x + -1.2 = -1.743559577 Simplifying x + -1.2 = -1.743559577 Reorder the terms: -1.2 + x = -1.743559577 Solving -1.2 + x = -1.743559577 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -1.743559577 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -1.743559577 + 1.2 x = -1.743559577 + 1.2 Combine like terms: -1.743559577 + 1.2 = -0.543559577 x = -0.543559577 Simplifying x = -0.543559577

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.943559577, -0.543559577}

See similar equations:

| -7+2x-(2+4x)=5-2x+3 | | 9u+4v=-24 | | -11u-7v=4 | | f(x)=3x^2-4x+1 | | 27+6z= | | 10y^2+48y+0= | | -5r-3s=36 | | 4e^5x=16 | | n-10-30-1/2-29.45= | | 9r+4s=-58 | | log^2(x+18)=4 | | 3/4*24-8b | | 9c^2-15=1 | | -11f+5g=-28 | | 2x^2+3=2x-8 | | 12+n+5=-3 | | y=-12.5x+625 | | (7/3)v-(2/5)=-2v-(7/3) | | 47.39+0.20m=39.99 | | -6f-8g=-22 | | 12.7-3.5= | | (2m+1)*x-1(3m-1)*x+2=0 | | 2x^2/2=500 | | x(2x)/2=500 | | (2m+1)x^2-(3m-1)x+2=0 | | 2/5w=-6 | | -5/8w=-8 | | 4x^3+x=0 | | 5c+8d=54 | | 18x+42=14x+58 | | 2/3^5 | | 2a-1=0 |

Equations solver categories