8x^2+8x-4=-6x-5

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Solution for 8x^2+8x-4=-6x-5 equation:


Simplifying
8x2 + 8x + -4 = -6x + -5

Reorder the terms:
-4 + 8x + 8x2 = -6x + -5

Reorder the terms:
-4 + 8x + 8x2 = -5 + -6x

Solving
-4 + 8x + 8x2 = -5 + -6x

Solving for variable 'x'.

Reorder the terms:
-4 + 5 + 8x + 6x + 8x2 = -5 + -6x + 5 + 6x

Combine like terms: -4 + 5 = 1
1 + 8x + 6x + 8x2 = -5 + -6x + 5 + 6x

Combine like terms: 8x + 6x = 14x
1 + 14x + 8x2 = -5 + -6x + 5 + 6x

Reorder the terms:
1 + 14x + 8x2 = -5 + 5 + -6x + 6x

Combine like terms: -5 + 5 = 0
1 + 14x + 8x2 = 0 + -6x + 6x
1 + 14x + 8x2 = -6x + 6x

Combine like terms: -6x + 6x = 0
1 + 14x + 8x2 = 0

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

Divide each side by '8'.
0.125 + 1.75x + x2 = 0

Move the constant term to the right:

Add '-0.125' to each side of the equation.
0.125 + 1.75x + -0.125 + x2 = 0 + -0.125

Reorder the terms:
0.125 + -0.125 + 1.75x + x2 = 0 + -0.125

Combine like terms: 0.125 + -0.125 = 0.000
0.000 + 1.75x + x2 = 0 + -0.125
1.75x + x2 = 0 + -0.125

Combine like terms: 0 + -0.125 = -0.125
1.75x + x2 = -0.125

The x term is 1.75x.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75x + 0.765625 + x2 = -0.125 + 0.765625

Reorder the terms:
0.765625 + 1.75x + x2 = -0.125 + 0.765625

Combine like terms: -0.125 + 0.765625 = 0.640625
0.765625 + 1.75x + x2 = 0.640625

Factor a perfect square on the left side:
(x + 0.875)(x + 0.875) = 0.640625

Calculate the square root of the right side: 0.80039053

Break this problem into two subproblems by setting 
(x + 0.875) equal to 0.80039053 and -0.80039053.

Subproblem 1

x + 0.875 = 0.80039053 Simplifying x + 0.875 = 0.80039053 Reorder the terms: 0.875 + x = 0.80039053 Solving 0.875 + x = 0.80039053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = 0.80039053 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = 0.80039053 + -0.875 x = 0.80039053 + -0.875 Combine like terms: 0.80039053 + -0.875 = -0.07460947 x = -0.07460947 Simplifying x = -0.07460947

Subproblem 2

x + 0.875 = -0.80039053 Simplifying x + 0.875 = -0.80039053 Reorder the terms: 0.875 + x = -0.80039053 Solving 0.875 + x = -0.80039053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + x = -0.80039053 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + x = -0.80039053 + -0.875 x = -0.80039053 + -0.875 Combine like terms: -0.80039053 + -0.875 = -1.67539053 x = -1.67539053 Simplifying x = -1.67539053

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.07460947, -1.67539053}

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