5x^2+10x-64=0

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Solution for 5x^2+10x-64=0 equation:


Simplifying
5x2 + 10x + -64 = 0

Reorder the terms:
-64 + 10x + 5x2 = 0

Solving
-64 + 10x + 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'.
-12.8 + 2x + x2 = 0

Move the constant term to the right:

Add '12.8' to each side of the equation.
-12.8 + 2x + 12.8 + x2 = 0 + 12.8

Reorder the terms:
-12.8 + 12.8 + 2x + x2 = 0 + 12.8

Combine like terms: -12.8 + 12.8 = 0.0
0.0 + 2x + x2 = 0 + 12.8
2x + x2 = 0 + 12.8

Combine like terms: 0 + 12.8 = 12.8
2x + x2 = 12.8

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 12.8 + 1

Reorder the terms:
1 + 2x + x2 = 12.8 + 1

Combine like terms: 12.8 + 1 = 13.8
1 + 2x + x2 = 13.8

Factor a perfect square on the left side:
(x + 1)(x + 1) = 13.8

Calculate the square root of the right side: 3.714835124

Break this problem into two subproblems by setting 
(x + 1) equal to 3.714835124 and -3.714835124.

Subproblem 1

x + 1 = 3.714835124 Simplifying x + 1 = 3.714835124 Reorder the terms: 1 + x = 3.714835124 Solving 1 + x = 3.714835124 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.714835124 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.714835124 + -1 x = 3.714835124 + -1 Combine like terms: 3.714835124 + -1 = 2.714835124 x = 2.714835124 Simplifying x = 2.714835124

Subproblem 2

x + 1 = -3.714835124 Simplifying x + 1 = -3.714835124 Reorder the terms: 1 + x = -3.714835124 Solving 1 + x = -3.714835124 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.714835124 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.714835124 + -1 x = -3.714835124 + -1 Combine like terms: -3.714835124 + -1 = -4.714835124 x = -4.714835124 Simplifying x = -4.714835124

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.714835124, -4.714835124}

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