x^2+2=8x

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


Simplifying
x2 + 2 = 8x

Reorder the terms:
2 + x2 = 8x

Solving
2 + x2 = 8x

Solving for variable 'x'.

Reorder the terms:
2 + -8x + x2 = 8x + -8x

Combine like terms: 8x + -8x = 0
2 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + -8x + -2 + x2 = 0 + -2

Reorder the terms:
2 + -2 + -8x + x2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + -8x + x2 = 0 + -2
-8x + x2 = 0 + -2

Combine like terms: 0 + -2 = -2
-8x + x2 = -2

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 = -2 + 16

Reorder the terms:
16 + -8x + x2 = -2 + 16

Combine like terms: -2 + 16 = 14
16 + -8x + x2 = 14

Factor a perfect square on the left side:
(x + -4)(x + -4) = 14

Calculate the square root of the right side: 3.741657387

Break this problem into two subproblems by setting 
(x + -4) equal to 3.741657387 and -3.741657387.

Subproblem 1

x + -4 = 3.741657387 Simplifying x + -4 = 3.741657387 Reorder the terms: -4 + x = 3.741657387 Solving -4 + x = 3.741657387 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 = 3.741657387 + 4 Combine like terms: -4 + 4 = 0 0 + x = 3.741657387 + 4 x = 3.741657387 + 4 Combine like terms: 3.741657387 + 4 = 7.741657387 x = 7.741657387 Simplifying x = 7.741657387

Subproblem 2

x + -4 = -3.741657387 Simplifying x + -4 = -3.741657387 Reorder the terms: -4 + x = -3.741657387 Solving -4 + x = -3.741657387 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 = -3.741657387 + 4 Combine like terms: -4 + 4 = 0 0 + x = -3.741657387 + 4 x = -3.741657387 + 4 Combine like terms: -3.741657387 + 4 = 0.258342613 x = 0.258342613 Simplifying x = 0.258342613

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.741657387, 0.258342613}

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