8x^2+16x-77=0

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Solution for 8x^2+16x-77=0 equation:


Simplifying
8x2 + 16x + -77 = 0

Reorder the terms:
-77 + 16x + 8x2 = 0

Solving
-77 + 16x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-9.625 + 2x + x2 = 0

Move the constant term to the right:

Add '9.625' to each side of the equation.
-9.625 + 2x + 9.625 + x2 = 0 + 9.625

Reorder the terms:
-9.625 + 9.625 + 2x + x2 = 0 + 9.625

Combine like terms: -9.625 + 9.625 = 0.000
0.000 + 2x + x2 = 0 + 9.625
2x + x2 = 0 + 9.625

Combine like terms: 0 + 9.625 = 9.625
2x + x2 = 9.625

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 = 9.625 + 1

Reorder the terms:
1 + 2x + x2 = 9.625 + 1

Combine like terms: 9.625 + 1 = 10.625
1 + 2x + x2 = 10.625

Factor a perfect square on the left side:
(x + 1)(x + 1) = 10.625

Calculate the square root of the right side: 3.259601203

Break this problem into two subproblems by setting 
(x + 1) equal to 3.259601203 and -3.259601203.

Subproblem 1

x + 1 = 3.259601203 Simplifying x + 1 = 3.259601203 Reorder the terms: 1 + x = 3.259601203 Solving 1 + x = 3.259601203 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 = 3.259601203 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.259601203 + -1 x = 3.259601203 + -1 Combine like terms: 3.259601203 + -1 = 2.259601203 x = 2.259601203 Simplifying x = 2.259601203

Subproblem 2

x + 1 = -3.259601203 Simplifying x + 1 = -3.259601203 Reorder the terms: 1 + x = -3.259601203 Solving 1 + x = -3.259601203 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 = -3.259601203 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.259601203 + -1 x = -3.259601203 + -1 Combine like terms: -3.259601203 + -1 = -4.259601203 x = -4.259601203 Simplifying x = -4.259601203

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.259601203, -4.259601203}

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