9x^2-2x+25=8x^2+18x

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Solution for 9x^2-2x+25=8x^2+18x equation:


Simplifying
9x2 + -2x + 25 = 8x2 + 18x

Reorder the terms:
25 + -2x + 9x2 = 8x2 + 18x

Reorder the terms:
25 + -2x + 9x2 = 18x + 8x2

Solving
25 + -2x + 9x2 = 18x + 8x2

Solving for variable 'x'.

Reorder the terms:
25 + -2x + -18x + 9x2 + -8x2 = 18x + 8x2 + -18x + -8x2

Combine like terms: -2x + -18x = -20x
25 + -20x + 9x2 + -8x2 = 18x + 8x2 + -18x + -8x2

Combine like terms: 9x2 + -8x2 = 1x2
25 + -20x + 1x2 = 18x + 8x2 + -18x + -8x2

Reorder the terms:
25 + -20x + 1x2 = 18x + -18x + 8x2 + -8x2

Combine like terms: 18x + -18x = 0
25 + -20x + 1x2 = 0 + 8x2 + -8x2
25 + -20x + 1x2 = 8x2 + -8x2

Combine like terms: 8x2 + -8x2 = 0
25 + -20x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '-25' to each side of the equation.
25 + -20x + -25 + x2 = 0 + -25

Reorder the terms:
25 + -25 + -20x + x2 = 0 + -25

Combine like terms: 25 + -25 = 0
0 + -20x + x2 = 0 + -25
-20x + x2 = 0 + -25

Combine like terms: 0 + -25 = -25
-20x + x2 = -25

The x term is -20x.  Take half its coefficient (-10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
-20x + 100 + x2 = -25 + 100

Reorder the terms:
100 + -20x + x2 = -25 + 100

Combine like terms: -25 + 100 = 75
100 + -20x + x2 = 75

Factor a perfect square on the left side:
(x + -10)(x + -10) = 75

Calculate the square root of the right side: 8.660254038

Break this problem into two subproblems by setting 
(x + -10) equal to 8.660254038 and -8.660254038.

Subproblem 1

x + -10 = 8.660254038 Simplifying x + -10 = 8.660254038 Reorder the terms: -10 + x = 8.660254038 Solving -10 + x = 8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = 8.660254038 + 10 Combine like terms: -10 + 10 = 0 0 + x = 8.660254038 + 10 x = 8.660254038 + 10 Combine like terms: 8.660254038 + 10 = 18.660254038 x = 18.660254038 Simplifying x = 18.660254038

Subproblem 2

x + -10 = -8.660254038 Simplifying x + -10 = -8.660254038 Reorder the terms: -10 + x = -8.660254038 Solving -10 + x = -8.660254038 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10' to each side of the equation. -10 + 10 + x = -8.660254038 + 10 Combine like terms: -10 + 10 = 0 0 + x = -8.660254038 + 10 x = -8.660254038 + 10 Combine like terms: -8.660254038 + 10 = 1.339745962 x = 1.339745962 Simplifying x = 1.339745962

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.660254038, 1.339745962}

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