-2x^2+24x=71

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Solution for -2x^2+24x=71 equation:


Simplifying
-2x2 + 24x = 71

Reorder the terms:
24x + -2x2 = 71

Solving
24x + -2x2 = 71

Solving for variable 'x'.

Reorder the terms:
-71 + 24x + -2x2 = 71 + -71

Combine like terms: 71 + -71 = 0
-71 + 24x + -2x2 = 0

Begin completing the square.  Divide all terms by
-2 the coefficient of the squared term: 

Divide each side by '-2'.
35.5 + -12x + x2 = 0

Move the constant term to the right:

Add '-35.5' to each side of the equation.
35.5 + -12x + -35.5 + x2 = 0 + -35.5

Reorder the terms:
35.5 + -35.5 + -12x + x2 = 0 + -35.5

Combine like terms: 35.5 + -35.5 = 0.0
0.0 + -12x + x2 = 0 + -35.5
-12x + x2 = 0 + -35.5

Combine like terms: 0 + -35.5 = -35.5
-12x + x2 = -35.5

The x term is -12x.  Take half its coefficient (-6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
-12x + 36 + x2 = -35.5 + 36

Reorder the terms:
36 + -12x + x2 = -35.5 + 36

Combine like terms: -35.5 + 36 = 0.5
36 + -12x + x2 = 0.5

Factor a perfect square on the left side:
(x + -6)(x + -6) = 0.5

Calculate the square root of the right side: 0.707106781

Break this problem into two subproblems by setting 
(x + -6) equal to 0.707106781 and -0.707106781.

Subproblem 1

x + -6 = 0.707106781 Simplifying x + -6 = 0.707106781 Reorder the terms: -6 + x = 0.707106781 Solving -6 + x = 0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = 0.707106781 + 6 Combine like terms: -6 + 6 = 0 0 + x = 0.707106781 + 6 x = 0.707106781 + 6 Combine like terms: 0.707106781 + 6 = 6.707106781 x = 6.707106781 Simplifying x = 6.707106781

Subproblem 2

x + -6 = -0.707106781 Simplifying x + -6 = -0.707106781 Reorder the terms: -6 + x = -0.707106781 Solving -6 + x = -0.707106781 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6' to each side of the equation. -6 + 6 + x = -0.707106781 + 6 Combine like terms: -6 + 6 = 0 0 + x = -0.707106781 + 6 x = -0.707106781 + 6 Combine like terms: -0.707106781 + 6 = 5.292893219 x = 5.292893219 Simplifying x = 5.292893219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.707106781, 5.292893219}

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