x^2=8x+76

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Solution for x^2=8x+76 equation:


Simplifying
x2 = 8x + 76

Reorder the terms:
x2 = 76 + 8x

Solving
x2 = 76 + 8x

Solving for variable 'x'.

Reorder the terms:
-76 + -8x + x2 = 76 + 8x + -76 + -8x

Reorder the terms:
-76 + -8x + x2 = 76 + -76 + 8x + -8x

Combine like terms: 76 + -76 = 0
-76 + -8x + x2 = 0 + 8x + -8x
-76 + -8x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
-76 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '76' to each side of the equation.
-76 + -8x + 76 + x2 = 0 + 76

Reorder the terms:
-76 + 76 + -8x + x2 = 0 + 76

Combine like terms: -76 + 76 = 0
0 + -8x + x2 = 0 + 76
-8x + x2 = 0 + 76

Combine like terms: 0 + 76 = 76
-8x + x2 = 76

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 = 76 + 16

Reorder the terms:
16 + -8x + x2 = 76 + 16

Combine like terms: 76 + 16 = 92
16 + -8x + x2 = 92

Factor a perfect square on the left side:
(x + -4)(x + -4) = 92

Calculate the square root of the right side: 9.591663047

Break this problem into two subproblems by setting 
(x + -4) equal to 9.591663047 and -9.591663047.

Subproblem 1

x + -4 = 9.591663047 Simplifying x + -4 = 9.591663047 Reorder the terms: -4 + x = 9.591663047 Solving -4 + x = 9.591663047 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 = 9.591663047 + 4 Combine like terms: -4 + 4 = 0 0 + x = 9.591663047 + 4 x = 9.591663047 + 4 Combine like terms: 9.591663047 + 4 = 13.591663047 x = 13.591663047 Simplifying x = 13.591663047

Subproblem 2

x + -4 = -9.591663047 Simplifying x + -4 = -9.591663047 Reorder the terms: -4 + x = -9.591663047 Solving -4 + x = -9.591663047 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 = -9.591663047 + 4 Combine like terms: -4 + 4 = 0 0 + x = -9.591663047 + 4 x = -9.591663047 + 4 Combine like terms: -9.591663047 + 4 = -5.591663047 x = -5.591663047 Simplifying x = -5.591663047

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.591663047, -5.591663047}

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