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 = 0.543559577 x = 0.543559577 Simplifying x = 0.543559577

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 = -2.943559577 x = -2.943559577 Simplifying x = -2.943559577

Solution

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

See similar equations:

| -2+.80x=6 | | 46-3x=11-8x | | -1(1+7x)-(2+x-4)=36+5x(3+4) | | 6(2x-1)-2=7+12(X-1) | | X^2+10x-78=0 | | -0.1x+1.18=-0.3x+7.98 | | k(2k+9)(k-8)=0 | | 3x^2-16x=4x^2-3x-6 | | 34(37-6.5x)=14(6x-11)+70 | | 8+7x=-22+x | | (3x-y)(3x+y)= | | 2x+6=96 | | 3x^2-4y^2+3x+16y-18=0 | | u+1.6=7.25 | | 5-2lnx=3 | | 2x^4-4x^3-7x^2-2x=0 | | 5(x+6)=30+5x | | (x+1+i)(x+1-i)=0 | | 2(3x-7y)= | | 30-5x-5x^2=0 | | 4x+(-12x+15)=3(x-6) | | 3x+6+5(-x)=0 | | X-1+6x+1=56 | | 2/3x+1/2=-6 | | 4m+3(5m-2)= | | 3x-5=10x+10 | | 5xs+6=3xs-2 | | 3x-6=10x+10 | | -15=4m+15 | | e+11.8=13.1 | | 1-x-4(1-x)= | | t(5t+5)=0 |

Equations solver categories