-8x^2+15x=88-9x^2

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Solution for -8x^2+15x=88-9x^2 equation:


Simplifying
-8x2 + 15x = 88 + -9x2

Reorder the terms:
15x + -8x2 = 88 + -9x2

Solving
15x + -8x2 = 88 + -9x2

Solving for variable 'x'.

Reorder the terms:
-88 + 15x + -8x2 + 9x2 = 88 + -9x2 + -88 + 9x2

Combine like terms: -8x2 + 9x2 = 1x2
-88 + 15x + 1x2 = 88 + -9x2 + -88 + 9x2

Reorder the terms:
-88 + 15x + 1x2 = 88 + -88 + -9x2 + 9x2

Combine like terms: 88 + -88 = 0
-88 + 15x + 1x2 = 0 + -9x2 + 9x2
-88 + 15x + 1x2 = -9x2 + 9x2

Combine like terms: -9x2 + 9x2 = 0
-88 + 15x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '88' to each side of the equation.
-88 + 15x + 88 + x2 = 0 + 88

Reorder the terms:
-88 + 88 + 15x + x2 = 0 + 88

Combine like terms: -88 + 88 = 0
0 + 15x + x2 = 0 + 88
15x + x2 = 0 + 88

Combine like terms: 0 + 88 = 88
15x + x2 = 88

The x term is 15x.  Take half its coefficient (7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
15x + 56.25 + x2 = 88 + 56.25

Reorder the terms:
56.25 + 15x + x2 = 88 + 56.25

Combine like terms: 88 + 56.25 = 144.25
56.25 + 15x + x2 = 144.25

Factor a perfect square on the left side:
(x + 7.5)(x + 7.5) = 144.25

Calculate the square root of the right side: 12.010412149

Break this problem into two subproblems by setting 
(x + 7.5) equal to 12.010412149 and -12.010412149.

Subproblem 1

x + 7.5 = 12.010412149 Simplifying x + 7.5 = 12.010412149 Reorder the terms: 7.5 + x = 12.010412149 Solving 7.5 + x = 12.010412149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = 12.010412149 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = 12.010412149 + -7.5 x = 12.010412149 + -7.5 Combine like terms: 12.010412149 + -7.5 = 4.510412149 x = 4.510412149 Simplifying x = 4.510412149

Subproblem 2

x + 7.5 = -12.010412149 Simplifying x + 7.5 = -12.010412149 Reorder the terms: 7.5 + x = -12.010412149 Solving 7.5 + x = -12.010412149 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-7.5' to each side of the equation. 7.5 + -7.5 + x = -12.010412149 + -7.5 Combine like terms: 7.5 + -7.5 = 0.0 0.0 + x = -12.010412149 + -7.5 x = -12.010412149 + -7.5 Combine like terms: -12.010412149 + -7.5 = -19.510412149 x = -19.510412149 Simplifying x = -19.510412149

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.510412149, -19.510412149}

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