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

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


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

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

Combine like terms: 9x + -2x = 7x
25 + 7x = 8x2 + 8x

Reorder the terms:
25 + 7x = 8x + 8x2

Solving
25 + 7x = 8x + 8x2

Solving for variable 'x'.

Combine like terms: 7x + -8x = -1x
25 + -1x + -8x2 = 8x + 8x2 + -8x + -8x2

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

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

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

Begin completing the square.  Divide all terms by
-8 the coefficient of the squared term: 

Divide each side by '-8'.
-3.125 + 0.125x + x2 = 0

Move the constant term to the right:

Add '3.125' to each side of the equation.
-3.125 + 0.125x + 3.125 + x2 = 0 + 3.125

Reorder the terms:
-3.125 + 3.125 + 0.125x + x2 = 0 + 3.125

Combine like terms: -3.125 + 3.125 = 0.000
0.000 + 0.125x + x2 = 0 + 3.125
0.125x + x2 = 0 + 3.125

Combine like terms: 0 + 3.125 = 3.125
0.125x + x2 = 3.125

The x term is 0.125x.  Take half its coefficient (0.0625).
Square it (0.00390625) and add it to both sides.

Add '0.00390625' to each side of the equation.
0.125x + 0.00390625 + x2 = 3.125 + 0.00390625

Reorder the terms:
0.00390625 + 0.125x + x2 = 3.125 + 0.00390625

Combine like terms: 3.125 + 0.00390625 = 3.12890625
0.00390625 + 0.125x + x2 = 3.12890625

Factor a perfect square on the left side:
(x + 0.0625)(x + 0.0625) = 3.12890625

Calculate the square root of the right side: 1.768871462

Break this problem into two subproblems by setting 
(x + 0.0625) equal to 1.768871462 and -1.768871462.

Subproblem 1

x + 0.0625 = 1.768871462 Simplifying x + 0.0625 = 1.768871462 Reorder the terms: 0.0625 + x = 1.768871462 Solving 0.0625 + x = 1.768871462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + x = 1.768871462 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + x = 1.768871462 + -0.0625 x = 1.768871462 + -0.0625 Combine like terms: 1.768871462 + -0.0625 = 1.706371462 x = 1.706371462 Simplifying x = 1.706371462

Subproblem 2

x + 0.0625 = -1.768871462 Simplifying x + 0.0625 = -1.768871462 Reorder the terms: 0.0625 + x = -1.768871462 Solving 0.0625 + x = -1.768871462 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.0625' to each side of the equation. 0.0625 + -0.0625 + x = -1.768871462 + -0.0625 Combine like terms: 0.0625 + -0.0625 = 0.0000 0.0000 + x = -1.768871462 + -0.0625 x = -1.768871462 + -0.0625 Combine like terms: -1.768871462 + -0.0625 = -1.831371462 x = -1.831371462 Simplifying x = -1.831371462

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.706371462, -1.831371462}

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