8x^2-40x-50=5x^2-35

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Solution for 8x^2-40x-50=5x^2-35 equation:


Simplifying
8x2 + -40x + -50 = 5x2 + -35

Reorder the terms:
-50 + -40x + 8x2 = 5x2 + -35

Reorder the terms:
-50 + -40x + 8x2 = -35 + 5x2

Solving
-50 + -40x + 8x2 = -35 + 5x2

Solving for variable 'x'.

Reorder the terms:
-50 + 35 + -40x + 8x2 + -5x2 = -35 + 5x2 + 35 + -5x2

Combine like terms: -50 + 35 = -15
-15 + -40x + 8x2 + -5x2 = -35 + 5x2 + 35 + -5x2

Combine like terms: 8x2 + -5x2 = 3x2
-15 + -40x + 3x2 = -35 + 5x2 + 35 + -5x2

Reorder the terms:
-15 + -40x + 3x2 = -35 + 35 + 5x2 + -5x2

Combine like terms: -35 + 35 = 0
-15 + -40x + 3x2 = 0 + 5x2 + -5x2
-15 + -40x + 3x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
-15 + -40x + 3x2 = 0

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

Divide each side by '3'.
-5 + -13.33333333x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -13.33333333x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -13.33333333x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -13.33333333x + x2 = 0 + 5
-13.33333333x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-13.33333333x + x2 = 5

The x term is -13.33333333x.  Take half its coefficient (-6.666666665).
Square it (44.44444442) and add it to both sides.

Add '44.44444442' to each side of the equation.
-13.33333333x + 44.44444442 + x2 = 5 + 44.44444442

Reorder the terms:
44.44444442 + -13.33333333x + x2 = 5 + 44.44444442

Combine like terms: 5 + 44.44444442 = 49.44444442
44.44444442 + -13.33333333x + x2 = 49.44444442

Factor a perfect square on the left side:
(x + -6.666666665)(x + -6.666666665) = 49.44444442

Calculate the square root of the right side: 7.031674368

Break this problem into two subproblems by setting 
(x + -6.666666665) equal to 7.031674368 and -7.031674368.

Subproblem 1

x + -6.666666665 = 7.031674368 Simplifying x + -6.666666665 = 7.031674368 Reorder the terms: -6.666666665 + x = 7.031674368 Solving -6.666666665 + x = 7.031674368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = 7.031674368 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = 7.031674368 + 6.666666665 x = 7.031674368 + 6.666666665 Combine like terms: 7.031674368 + 6.666666665 = 13.698341033 x = 13.698341033 Simplifying x = 13.698341033

Subproblem 2

x + -6.666666665 = -7.031674368 Simplifying x + -6.666666665 = -7.031674368 Reorder the terms: -6.666666665 + x = -7.031674368 Solving -6.666666665 + x = -7.031674368 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.666666665' to each side of the equation. -6.666666665 + 6.666666665 + x = -7.031674368 + 6.666666665 Combine like terms: -6.666666665 + 6.666666665 = 0.000000000 0.000000000 + x = -7.031674368 + 6.666666665 x = -7.031674368 + 6.666666665 Combine like terms: -7.031674368 + 6.666666665 = -0.365007703 x = -0.365007703 Simplifying x = -0.365007703

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.698341033, -0.365007703}

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