-x^2+4x=-49

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Solution for -x^2+4x=-49 equation:


Simplifying
-1x2 + 4x = -49

Reorder the terms:
4x + -1x2 = -49

Solving
4x + -1x2 = -49

Solving for variable 'x'.

Reorder the terms:
49 + 4x + -1x2 = -49 + 49

Combine like terms: -49 + 49 = 0
49 + 4x + -1x2 = 0

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

Divide each side by '-1'.
-49 + -4x + x2 = 0

Move the constant term to the right:

Add '49' to each side of the equation.
-49 + -4x + 49 + x2 = 0 + 49

Reorder the terms:
-49 + 49 + -4x + x2 = 0 + 49

Combine like terms: -49 + 49 = 0
0 + -4x + x2 = 0 + 49
-4x + x2 = 0 + 49

Combine like terms: 0 + 49 = 49
-4x + x2 = 49

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 49 + 4

Reorder the terms:
4 + -4x + x2 = 49 + 4

Combine like terms: 49 + 4 = 53
4 + -4x + x2 = 53

Factor a perfect square on the left side:
(x + -2)(x + -2) = 53

Calculate the square root of the right side: 7.280109889

Break this problem into two subproblems by setting 
(x + -2) equal to 7.280109889 and -7.280109889.

Subproblem 1

x + -2 = 7.280109889 Simplifying x + -2 = 7.280109889 Reorder the terms: -2 + x = 7.280109889 Solving -2 + x = 7.280109889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 7.280109889 + 2 Combine like terms: -2 + 2 = 0 0 + x = 7.280109889 + 2 x = 7.280109889 + 2 Combine like terms: 7.280109889 + 2 = 9.280109889 x = 9.280109889 Simplifying x = 9.280109889

Subproblem 2

x + -2 = -7.280109889 Simplifying x + -2 = -7.280109889 Reorder the terms: -2 + x = -7.280109889 Solving -2 + x = -7.280109889 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -7.280109889 + 2 Combine like terms: -2 + 2 = 0 0 + x = -7.280109889 + 2 x = -7.280109889 + 2 Combine like terms: -7.280109889 + 2 = -5.280109889 x = -5.280109889 Simplifying x = -5.280109889

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.280109889, -5.280109889}

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