5x^2+80x+64=0

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Solution for 5x^2+80x+64=0 equation:


Simplifying
5x2 + 80x + 64 = 0

Reorder the terms:
64 + 80x + 5x2 = 0

Solving
64 + 80x + 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 + 16x + x2 = 0

Move the constant term to the right:

Add '-12.8' to each side of the equation.
12.8 + 16x + -12.8 + x2 = 0 + -12.8

Reorder the terms:
12.8 + -12.8 + 16x + x2 = 0 + -12.8

Combine like terms: 12.8 + -12.8 = 0.0
0.0 + 16x + x2 = 0 + -12.8
16x + x2 = 0 + -12.8

Combine like terms: 0 + -12.8 = -12.8
16x + x2 = -12.8

The x term is 16x.  Take half its coefficient (8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
16x + 64 + x2 = -12.8 + 64

Reorder the terms:
64 + 16x + x2 = -12.8 + 64

Combine like terms: -12.8 + 64 = 51.2
64 + 16x + x2 = 51.2

Factor a perfect square on the left side:
(x + 8)(x + 8) = 51.2

Calculate the square root of the right side: 7.155417528

Break this problem into two subproblems by setting 
(x + 8) equal to 7.155417528 and -7.155417528.

Subproblem 1

x + 8 = 7.155417528 Simplifying x + 8 = 7.155417528 Reorder the terms: 8 + x = 7.155417528 Solving 8 + x = 7.155417528 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = 7.155417528 + -8 Combine like terms: 8 + -8 = 0 0 + x = 7.155417528 + -8 x = 7.155417528 + -8 Combine like terms: 7.155417528 + -8 = -0.844582472 x = -0.844582472 Simplifying x = -0.844582472

Subproblem 2

x + 8 = -7.155417528 Simplifying x + 8 = -7.155417528 Reorder the terms: 8 + x = -7.155417528 Solving 8 + x = -7.155417528 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + x = -7.155417528 + -8 Combine like terms: 8 + -8 = 0 0 + x = -7.155417528 + -8 x = -7.155417528 + -8 Combine like terms: -7.155417528 + -8 = -15.155417528 x = -15.155417528 Simplifying x = -15.155417528

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.844582472, -15.155417528}

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