-x^2+8x+75=13

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Solution for -x^2+8x+75=13 equation:


Simplifying
-1x2 + 8x + 75 = 13

Reorder the terms:
75 + 8x + -1x2 = 13

Solving
75 + 8x + -1x2 = 13

Solving for variable 'x'.

Reorder the terms:
75 + -13 + 8x + -1x2 = 13 + -13

Combine like terms: 75 + -13 = 62
62 + 8x + -1x2 = 13 + -13

Combine like terms: 13 + -13 = 0
62 + 8x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-62 + -8x + x2 = 0

Move the constant term to the right:

Add '62' to each side of the equation.
-62 + -8x + 62 + x2 = 0 + 62

Reorder the terms:
-62 + 62 + -8x + x2 = 0 + 62

Combine like terms: -62 + 62 = 0
0 + -8x + x2 = 0 + 62
-8x + x2 = 0 + 62

Combine like terms: 0 + 62 = 62
-8x + x2 = 62

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 = 62 + 16

Reorder the terms:
16 + -8x + x2 = 62 + 16

Combine like terms: 62 + 16 = 78
16 + -8x + x2 = 78

Factor a perfect square on the left side:
(x + -4)(x + -4) = 78

Calculate the square root of the right side: 8.831760866

Break this problem into two subproblems by setting 
(x + -4) equal to 8.831760866 and -8.831760866.

Subproblem 1

x + -4 = 8.831760866 Simplifying x + -4 = 8.831760866 Reorder the terms: -4 + x = 8.831760866 Solving -4 + x = 8.831760866 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 = 8.831760866 + 4 Combine like terms: -4 + 4 = 0 0 + x = 8.831760866 + 4 x = 8.831760866 + 4 Combine like terms: 8.831760866 + 4 = 12.831760866 x = 12.831760866 Simplifying x = 12.831760866

Subproblem 2

x + -4 = -8.831760866 Simplifying x + -4 = -8.831760866 Reorder the terms: -4 + x = -8.831760866 Solving -4 + x = -8.831760866 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 = -8.831760866 + 4 Combine like terms: -4 + 4 = 0 0 + x = -8.831760866 + 4 x = -8.831760866 + 4 Combine like terms: -8.831760866 + 4 = -4.831760866 x = -4.831760866 Simplifying x = -4.831760866

Solution

The solution to the problem is based on the solutions from the subproblems. x = {12.831760866, -4.831760866}

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