x*x+8x=50

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Solution for x*x+8x=50 equation:


Simplifying
x * x + 8x = 50

Multiply x * x
x2 + 8x = 50

Reorder the terms:
8x + x2 = 50

Solving
8x + x2 = 50

Solving for variable 'x'.

Reorder the terms:
-50 + 8x + x2 = 50 + -50

Combine like terms: 50 + -50 = 0
-50 + 8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '50' to each side of the equation.
-50 + 8x + 50 + x2 = 0 + 50

Reorder the terms:
-50 + 50 + 8x + x2 = 0 + 50

Combine like terms: -50 + 50 = 0
0 + 8x + x2 = 0 + 50
8x + x2 = 0 + 50

Combine like terms: 0 + 50 = 50
8x + x2 = 50

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 = 50 + 16

Reorder the terms:
16 + 8x + x2 = 50 + 16

Combine like terms: 50 + 16 = 66
16 + 8x + x2 = 66

Factor a perfect square on the left side:
(x + 4)(x + 4) = 66

Calculate the square root of the right side: 8.124038405

Break this problem into two subproblems by setting 
(x + 4) equal to 8.124038405 and -8.124038405.

Subproblem 1

x + 4 = 8.124038405 Simplifying x + 4 = 8.124038405 Reorder the terms: 4 + x = 8.124038405 Solving 4 + x = 8.124038405 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 = 8.124038405 + -4 Combine like terms: 4 + -4 = 0 0 + x = 8.124038405 + -4 x = 8.124038405 + -4 Combine like terms: 8.124038405 + -4 = 4.124038405 x = 4.124038405 Simplifying x = 4.124038405

Subproblem 2

x + 4 = -8.124038405 Simplifying x + 4 = -8.124038405 Reorder the terms: 4 + x = -8.124038405 Solving 4 + x = -8.124038405 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 = -8.124038405 + -4 Combine like terms: 4 + -4 = 0 0 + x = -8.124038405 + -4 x = -8.124038405 + -4 Combine like terms: -8.124038405 + -4 = -12.124038405 x = -12.124038405 Simplifying x = -12.124038405

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.124038405, -12.124038405}

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