-2x^2+24x-15=0

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Solution for -2x^2+24x-15=0 equation:


Simplifying
-2x2 + 24x + -15 = 0

Reorder the terms:
-15 + 24x + -2x2 = 0

Solving
-15 + 24x + -2x2 = 0

Solving for variable 'x'.

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

Divide each side by '-2'.
7.5 + -12x + x2 = 0

Move the constant term to the right:

Add '-7.5' to each side of the equation.
7.5 + -12x + -7.5 + x2 = 0 + -7.5

Reorder the terms:
7.5 + -7.5 + -12x + x2 = 0 + -7.5

Combine like terms: 7.5 + -7.5 = 0.0
0.0 + -12x + x2 = 0 + -7.5
-12x + x2 = 0 + -7.5

Combine like terms: 0 + -7.5 = -7.5
-12x + x2 = -7.5

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 = -7.5 + 36

Reorder the terms:
36 + -12x + x2 = -7.5 + 36

Combine like terms: -7.5 + 36 = 28.5
36 + -12x + x2 = 28.5

Factor a perfect square on the left side:
(x + -6)(x + -6) = 28.5

Calculate the square root of the right side: 5.338539126

Break this problem into two subproblems by setting 
(x + -6) equal to 5.338539126 and -5.338539126.

Subproblem 1

x + -6 = 5.338539126 Simplifying x + -6 = 5.338539126 Reorder the terms: -6 + x = 5.338539126 Solving -6 + x = 5.338539126 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 = 5.338539126 + 6 Combine like terms: -6 + 6 = 0 0 + x = 5.338539126 + 6 x = 5.338539126 + 6 Combine like terms: 5.338539126 + 6 = 11.338539126 x = 11.338539126 Simplifying x = 11.338539126

Subproblem 2

x + -6 = -5.338539126 Simplifying x + -6 = -5.338539126 Reorder the terms: -6 + x = -5.338539126 Solving -6 + x = -5.338539126 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 = -5.338539126 + 6 Combine like terms: -6 + 6 = 0 0 + x = -5.338539126 + 6 x = -5.338539126 + 6 Combine like terms: -5.338539126 + 6 = 0.661460874 x = 0.661460874 Simplifying x = 0.661460874

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.338539126, 0.661460874}

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