x(x)+8x=130

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Solution for x(x)+8x=130 equation:


Simplifying
x(x) + 8x = 130

Multiply x * x
x2 + 8x = 130

Reorder the terms:
8x + x2 = 130

Solving
8x + x2 = 130

Solving for variable 'x'.

Reorder the terms:
-130 + 8x + x2 = 130 + -130

Combine like terms: 130 + -130 = 0
-130 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '130' to each side of the equation.
-130 + 8x + 130 + x2 = 0 + 130

Reorder the terms:
-130 + 130 + 8x + x2 = 0 + 130

Combine like terms: -130 + 130 = 0
0 + 8x + x2 = 0 + 130
8x + x2 = 0 + 130

Combine like terms: 0 + 130 = 130
8x + x2 = 130

The x term is 8x.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8x + 16 + x2 = 130 + 16

Reorder the terms:
16 + 8x + x2 = 130 + 16

Combine like terms: 130 + 16 = 146
16 + 8x + x2 = 146

Factor a perfect square on the left side:
(x + 4)(x + 4) = 146

Calculate the square root of the right side: 12.083045974

Break this problem into two subproblems by setting 
(x + 4) equal to 12.083045974 and -12.083045974.

Subproblem 1

x + 4 = 12.083045974 Simplifying x + 4 = 12.083045974 Reorder the terms: 4 + x = 12.083045974 Solving 4 + x = 12.083045974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = 12.083045974 + -4 Combine like terms: 4 + -4 = 0 0 + x = 12.083045974 + -4 x = 12.083045974 + -4 Combine like terms: 12.083045974 + -4 = 8.083045974 x = 8.083045974 Simplifying x = 8.083045974

Subproblem 2

x + 4 = -12.083045974 Simplifying x + 4 = -12.083045974 Reorder the terms: 4 + x = -12.083045974 Solving 4 + x = -12.083045974 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + x = -12.083045974 + -4 Combine like terms: 4 + -4 = 0 0 + x = -12.083045974 + -4 x = -12.083045974 + -4 Combine like terms: -12.083045974 + -4 = -16.083045974 x = -16.083045974 Simplifying x = -16.083045974

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.083045974, -16.083045974}

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