x*x+10x=-8

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Solution for x*x+10x=-8 equation:


Simplifying
x * x + 10x = -8

Multiply x * x
x2 + 10x = -8

Reorder the terms:
10x + x2 = -8

Solving
10x + x2 = -8

Solving for variable 'x'.

Reorder the terms:
8 + 10x + x2 = -8 + 8

Combine like terms: -8 + 8 = 0
8 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-8' to each side of the equation.
8 + 10x + -8 + x2 = 0 + -8

Reorder the terms:
8 + -8 + 10x + x2 = 0 + -8

Combine like terms: 8 + -8 = 0
0 + 10x + x2 = 0 + -8
10x + x2 = 0 + -8

Combine like terms: 0 + -8 = -8
10x + x2 = -8

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 = -8 + 25

Reorder the terms:
25 + 10x + x2 = -8 + 25

Combine like terms: -8 + 25 = 17
25 + 10x + x2 = 17

Factor a perfect square on the left side:
(x + 5)(x + 5) = 17

Calculate the square root of the right side: 4.123105626

Break this problem into two subproblems by setting 
(x + 5) equal to 4.123105626 and -4.123105626.

Subproblem 1

x + 5 = 4.123105626 Simplifying x + 5 = 4.123105626 Reorder the terms: 5 + x = 4.123105626 Solving 5 + x = 4.123105626 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 = 4.123105626 + -5 Combine like terms: 5 + -5 = 0 0 + x = 4.123105626 + -5 x = 4.123105626 + -5 Combine like terms: 4.123105626 + -5 = -0.876894374 x = -0.876894374 Simplifying x = -0.876894374

Subproblem 2

x + 5 = -4.123105626 Simplifying x + 5 = -4.123105626 Reorder the terms: 5 + x = -4.123105626 Solving 5 + x = -4.123105626 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 = -4.123105626 + -5 Combine like terms: 5 + -5 = 0 0 + x = -4.123105626 + -5 x = -4.123105626 + -5 Combine like terms: -4.123105626 + -5 = -9.123105626 x = -9.123105626 Simplifying x = -9.123105626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.876894374, -9.123105626}

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