-x^2+8x=-37

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Solution for -x^2+8x=-37 equation:


Simplifying
-1x2 + 8x = -37

Reorder the terms:
8x + -1x2 = -37

Solving
8x + -1x2 = -37

Solving for variable 'x'.

Reorder the terms:
37 + 8x + -1x2 = -37 + 37

Combine like terms: -37 + 37 = 0
37 + 8x + -1x2 = 0

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

Divide each side by '-1'.
-37 + -8x + x2 = 0

Move the constant term to the right:

Add '37' to each side of the equation.
-37 + -8x + 37 + x2 = 0 + 37

Reorder the terms:
-37 + 37 + -8x + x2 = 0 + 37

Combine like terms: -37 + 37 = 0
0 + -8x + x2 = 0 + 37
-8x + x2 = 0 + 37

Combine like terms: 0 + 37 = 37
-8x + x2 = 37

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 = 37 + 16

Reorder the terms:
16 + -8x + x2 = 37 + 16

Combine like terms: 37 + 16 = 53
16 + -8x + x2 = 53

Factor a perfect square on the left side:
(x + -4)(x + -4) = 53

Calculate the square root of the right side: 7.280109889

Break this problem into two subproblems by setting 
(x + -4) equal to 7.280109889 and -7.280109889.

Subproblem 1

x + -4 = 7.280109889 Simplifying x + -4 = 7.280109889 Reorder the terms: -4 + x = 7.280109889 Solving -4 + x = 7.280109889 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 = 7.280109889 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.280109889 + 4 x = 7.280109889 + 4 Combine like terms: 7.280109889 + 4 = 11.280109889 x = 11.280109889 Simplifying x = 11.280109889

Subproblem 2

x + -4 = -7.280109889 Simplifying x + -4 = -7.280109889 Reorder the terms: -4 + x = -7.280109889 Solving -4 + x = -7.280109889 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 = -7.280109889 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.280109889 + 4 x = -7.280109889 + 4 Combine like terms: -7.280109889 + 4 = -3.280109889 x = -3.280109889 Simplifying x = -3.280109889

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.280109889, -3.280109889}

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