8x^2+16x-51=0

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Solution for 8x^2+16x-51=0 equation:


Simplifying
8x2 + 16x + -51 = 0

Reorder the terms:
-51 + 16x + 8x2 = 0

Solving
-51 + 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'.
-6.375 + 2x + x2 = 0

Move the constant term to the right:

Add '6.375' to each side of the equation.
-6.375 + 2x + 6.375 + x2 = 0 + 6.375

Reorder the terms:
-6.375 + 6.375 + 2x + x2 = 0 + 6.375

Combine like terms: -6.375 + 6.375 = 0.000
0.000 + 2x + x2 = 0 + 6.375
2x + x2 = 0 + 6.375

Combine like terms: 0 + 6.375 = 6.375
2x + x2 = 6.375

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 = 6.375 + 1

Reorder the terms:
1 + 2x + x2 = 6.375 + 1

Combine like terms: 6.375 + 1 = 7.375
1 + 2x + x2 = 7.375

Factor a perfect square on the left side:
(x + 1)(x + 1) = 7.375

Calculate the square root of the right side: 2.715695123

Break this problem into two subproblems by setting 
(x + 1) equal to 2.715695123 and -2.715695123.

Subproblem 1

x + 1 = 2.715695123 Simplifying x + 1 = 2.715695123 Reorder the terms: 1 + x = 2.715695123 Solving 1 + x = 2.715695123 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 = 2.715695123 + -1 Combine like terms: 1 + -1 = 0 0 + x = 2.715695123 + -1 x = 2.715695123 + -1 Combine like terms: 2.715695123 + -1 = 1.715695123 x = 1.715695123 Simplifying x = 1.715695123

Subproblem 2

x + 1 = -2.715695123 Simplifying x + 1 = -2.715695123 Reorder the terms: 1 + x = -2.715695123 Solving 1 + x = -2.715695123 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 = -2.715695123 + -1 Combine like terms: 1 + -1 = 0 0 + x = -2.715695123 + -1 x = -2.715695123 + -1 Combine like terms: -2.715695123 + -1 = -3.715695123 x = -3.715695123 Simplifying x = -3.715695123

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.715695123, -3.715695123}

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