-x^2+8x=-41

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Solution for -x^2+8x=-41 equation:


Simplifying
-1x2 + 8x = -41

Reorder the terms:
8x + -1x2 = -41

Solving
8x + -1x2 = -41

Solving for variable 'x'.

Reorder the terms:
41 + 8x + -1x2 = -41 + 41

Combine like terms: -41 + 41 = 0
41 + 8x + -1x2 = 0

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

Divide each side by '-1'.
-41 + -8x + x2 = 0

Move the constant term to the right:

Add '41' to each side of the equation.
-41 + -8x + 41 + x2 = 0 + 41

Reorder the terms:
-41 + 41 + -8x + x2 = 0 + 41

Combine like terms: -41 + 41 = 0
0 + -8x + x2 = 0 + 41
-8x + x2 = 0 + 41

Combine like terms: 0 + 41 = 41
-8x + x2 = 41

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 = 41 + 16

Reorder the terms:
16 + -8x + x2 = 41 + 16

Combine like terms: 41 + 16 = 57
16 + -8x + x2 = 57

Factor a perfect square on the left side:
(x + -4)(x + -4) = 57

Calculate the square root of the right side: 7.549834435

Break this problem into two subproblems by setting 
(x + -4) equal to 7.549834435 and -7.549834435.

Subproblem 1

x + -4 = 7.549834435 Simplifying x + -4 = 7.549834435 Reorder the terms: -4 + x = 7.549834435 Solving -4 + x = 7.549834435 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 = 7.549834435 + 4 Combine like terms: -4 + 4 = 0 0 + x = 7.549834435 + 4 x = 7.549834435 + 4 Combine like terms: 7.549834435 + 4 = 11.549834435 x = 11.549834435 Simplifying x = 11.549834435

Subproblem 2

x + -4 = -7.549834435 Simplifying x + -4 = -7.549834435 Reorder the terms: -4 + x = -7.549834435 Solving -4 + x = -7.549834435 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 = -7.549834435 + 4 Combine like terms: -4 + 4 = 0 0 + x = -7.549834435 + 4 x = -7.549834435 + 4 Combine like terms: -7.549834435 + 4 = -3.549834435 x = -3.549834435 Simplifying x = -3.549834435

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.549834435, -3.549834435}

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