8x^2-10x=45

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Solution for 8x^2-10x=45 equation:


Simplifying
8x2 + -10x = 45

Reorder the terms:
-10x + 8x2 = 45

Solving
-10x + 8x2 = 45

Solving for variable 'x'.

Reorder the terms:
-45 + -10x + 8x2 = 45 + -45

Combine like terms: 45 + -45 = 0
-45 + -10x + 8x2 = 0

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

Divide each side by '8'.
-5.625 + -1.25x + x2 = 0

Move the constant term to the right:

Add '5.625' to each side of the equation.
-5.625 + -1.25x + 5.625 + x2 = 0 + 5.625

Reorder the terms:
-5.625 + 5.625 + -1.25x + x2 = 0 + 5.625

Combine like terms: -5.625 + 5.625 = 0.000
0.000 + -1.25x + x2 = 0 + 5.625
-1.25x + x2 = 0 + 5.625

Combine like terms: 0 + 5.625 = 5.625
-1.25x + x2 = 5.625

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 5.625 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 5.625 + 0.390625

Combine like terms: 5.625 + 0.390625 = 6.015625
0.390625 + -1.25x + x2 = 6.015625

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 6.015625

Calculate the square root of the right side: 2.452677109

Break this problem into two subproblems by setting 
(x + -0.625) equal to 2.452677109 and -2.452677109.

Subproblem 1

x + -0.625 = 2.452677109 Simplifying x + -0.625 = 2.452677109 Reorder the terms: -0.625 + x = 2.452677109 Solving -0.625 + x = 2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 2.452677109 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 2.452677109 + 0.625 x = 2.452677109 + 0.625 Combine like terms: 2.452677109 + 0.625 = 3.077677109 x = 3.077677109 Simplifying x = 3.077677109

Subproblem 2

x + -0.625 = -2.452677109 Simplifying x + -0.625 = -2.452677109 Reorder the terms: -0.625 + x = -2.452677109 Solving -0.625 + x = -2.452677109 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -2.452677109 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -2.452677109 + 0.625 x = -2.452677109 + 0.625 Combine like terms: -2.452677109 + 0.625 = -1.827677109 x = -1.827677109 Simplifying x = -1.827677109

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.077677109, -1.827677109}

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