x^2+10x-51=0

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Solution for x^2+10x-51=0 equation:


Simplifying
x2 + 10x + -51 = 0

Reorder the terms:
-51 + 10x + x2 = 0

Solving
-51 + 10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + 10x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + 10x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + 10x + x2 = 0 + 51
10x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
10x + x2 = 51

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 51 + 25

Reorder the terms:
25 + 10x + x2 = 51 + 25

Combine like terms: 51 + 25 = 76
25 + 10x + x2 = 76

Factor a perfect square on the left side:
(x + 5)(x + 5) = 76

Calculate the square root of the right side: 8.717797887

Break this problem into two subproblems by setting 
(x + 5) equal to 8.717797887 and -8.717797887.

Subproblem 1

x + 5 = 8.717797887 Simplifying x + 5 = 8.717797887 Reorder the terms: 5 + x = 8.717797887 Solving 5 + x = 8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 8.717797887 + -5 Combine like terms: 5 + -5 = 0 0 + x = 8.717797887 + -5 x = 8.717797887 + -5 Combine like terms: 8.717797887 + -5 = 3.717797887 x = 3.717797887 Simplifying x = 3.717797887

Subproblem 2

x + 5 = -8.717797887 Simplifying x + 5 = -8.717797887 Reorder the terms: 5 + x = -8.717797887 Solving 5 + x = -8.717797887 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -8.717797887 + -5 Combine like terms: 5 + -5 = 0 0 + x = -8.717797887 + -5 x = -8.717797887 + -5 Combine like terms: -8.717797887 + -5 = -13.717797887 x = -13.717797887 Simplifying x = -13.717797887

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.717797887, -13.717797887}

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