x^2+10x-71=0

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Solution for x^2+10x-71=0 equation:


Simplifying
x2 + 10x + -71 = 0

Reorder the terms:
-71 + 10x + x2 = 0

Solving
-71 + 10x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '71' to each side of the equation.
-71 + 10x + 71 + x2 = 0 + 71

Reorder the terms:
-71 + 71 + 10x + x2 = 0 + 71

Combine like terms: -71 + 71 = 0
0 + 10x + x2 = 0 + 71
10x + x2 = 0 + 71

Combine like terms: 0 + 71 = 71
10x + x2 = 71

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 = 71 + 25

Reorder the terms:
25 + 10x + x2 = 71 + 25

Combine like terms: 71 + 25 = 96
25 + 10x + x2 = 96

Factor a perfect square on the left side:
(x + 5)(x + 5) = 96

Calculate the square root of the right side: 9.797958971

Break this problem into two subproblems by setting 
(x + 5) equal to 9.797958971 and -9.797958971.

Subproblem 1

x + 5 = 9.797958971 Simplifying x + 5 = 9.797958971 Reorder the terms: 5 + x = 9.797958971 Solving 5 + x = 9.797958971 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 = 9.797958971 + -5 Combine like terms: 5 + -5 = 0 0 + x = 9.797958971 + -5 x = 9.797958971 + -5 Combine like terms: 9.797958971 + -5 = 4.797958971 x = 4.797958971 Simplifying x = 4.797958971

Subproblem 2

x + 5 = -9.797958971 Simplifying x + 5 = -9.797958971 Reorder the terms: 5 + x = -9.797958971 Solving 5 + x = -9.797958971 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 = -9.797958971 + -5 Combine like terms: 5 + -5 = 0 0 + x = -9.797958971 + -5 x = -9.797958971 + -5 Combine like terms: -9.797958971 + -5 = -14.797958971 x = -14.797958971 Simplifying x = -14.797958971

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.797958971, -14.797958971}

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