5x^2+8x=660

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Solution for 5x^2+8x=660 equation:


Simplifying
5x2 + 8x = 660

Reorder the terms:
8x + 5x2 = 660

Solving
8x + 5x2 = 660

Solving for variable 'x'.

Reorder the terms:
-660 + 8x + 5x2 = 660 + -660

Combine like terms: 660 + -660 = 0
-660 + 8x + 5x2 = 0

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

Divide each side by '5'.
-132 + 1.6x + x2 = 0

Move the constant term to the right:

Add '132' to each side of the equation.
-132 + 1.6x + 132 + x2 = 0 + 132

Reorder the terms:
-132 + 132 + 1.6x + x2 = 0 + 132

Combine like terms: -132 + 132 = 0
0 + 1.6x + x2 = 0 + 132
1.6x + x2 = 0 + 132

Combine like terms: 0 + 132 = 132
1.6x + x2 = 132

The x term is 1.6x.  Take half its coefficient (0.8).
Square it (0.64) and add it to both sides.

Add '0.64' to each side of the equation.
1.6x + 0.64 + x2 = 132 + 0.64

Reorder the terms:
0.64 + 1.6x + x2 = 132 + 0.64

Combine like terms: 132 + 0.64 = 132.64
0.64 + 1.6x + x2 = 132.64

Factor a perfect square on the left side:
(x + 0.8)(x + 0.8) = 132.64

Calculate the square root of the right side: 11.516944039

Break this problem into two subproblems by setting 
(x + 0.8) equal to 11.516944039 and -11.516944039.

Subproblem 1

x + 0.8 = 11.516944039 Simplifying x + 0.8 = 11.516944039 Reorder the terms: 0.8 + x = 11.516944039 Solving 0.8 + x = 11.516944039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = 11.516944039 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = 11.516944039 + -0.8 x = 11.516944039 + -0.8 Combine like terms: 11.516944039 + -0.8 = 10.716944039 x = 10.716944039 Simplifying x = 10.716944039

Subproblem 2

x + 0.8 = -11.516944039 Simplifying x + 0.8 = -11.516944039 Reorder the terms: 0.8 + x = -11.516944039 Solving 0.8 + x = -11.516944039 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8' to each side of the equation. 0.8 + -0.8 + x = -11.516944039 + -0.8 Combine like terms: 0.8 + -0.8 = 0.0 0.0 + x = -11.516944039 + -0.8 x = -11.516944039 + -0.8 Combine like terms: -11.516944039 + -0.8 = -12.316944039 x = -12.316944039 Simplifying x = -12.316944039

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.716944039, -12.316944039}

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