x^2-8x+16=75

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Solution for x^2-8x+16=75 equation:


Simplifying
x2 + -8x + 16 = 75

Reorder the terms:
16 + -8x + x2 = 75

Solving
16 + -8x + x2 = 75

Solving for variable 'x'.

Reorder the terms:
16 + -75 + -8x + x2 = 75 + -75

Combine like terms: 16 + -75 = -59
-59 + -8x + x2 = 75 + -75

Combine like terms: 75 + -75 = 0
-59 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '59' to each side of the equation.
-59 + -8x + 59 + x2 = 0 + 59

Reorder the terms:
-59 + 59 + -8x + x2 = 0 + 59

Combine like terms: -59 + 59 = 0
0 + -8x + x2 = 0 + 59
-8x + x2 = 0 + 59

Combine like terms: 0 + 59 = 59
-8x + x2 = 59

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 = 59 + 16

Reorder the terms:
16 + -8x + x2 = 59 + 16

Combine like terms: 59 + 16 = 75
16 + -8x + x2 = 75

Factor a perfect square on the left side:
(x + -4)(x + -4) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(x + -4) equal to 8.660254038 and -8.660254038.

Subproblem 1

x + -4 = 8.660254038 Simplifying x + -4 = 8.660254038 Reorder the terms: -4 + x = 8.660254038 Solving -4 + x = 8.660254038 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 = 8.660254038 + 4 Combine like terms: -4 + 4 = 0 0 + x = 8.660254038 + 4 x = 8.660254038 + 4 Combine like terms: 8.660254038 + 4 = 12.660254038 x = 12.660254038 Simplifying x = 12.660254038

Subproblem 2

x + -4 = -8.660254038 Simplifying x + -4 = -8.660254038 Reorder the terms: -4 + x = -8.660254038 Solving -4 + x = -8.660254038 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 = -8.660254038 + 4 Combine like terms: -4 + 4 = 0 0 + x = -8.660254038 + 4 x = -8.660254038 + 4 Combine like terms: -8.660254038 + 4 = -4.660254038 x = -4.660254038 Simplifying x = -4.660254038

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.660254038, -4.660254038}

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