2x^2-26x=84

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Solution for 2x^2-26x=84 equation:


Simplifying
2x2 + -26x = 84

Reorder the terms:
-26x + 2x2 = 84

Solving
-26x + 2x2 = 84

Solving for variable 'x'.

Reorder the terms:
-84 + -26x + 2x2 = 84 + -84

Combine like terms: 84 + -84 = 0
-84 + -26x + 2x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-42 + -13x + x2) = 0

Ignore the factor 2.

Subproblem 1

Set the factor '(-42 + -13x + x2)' equal to zero and attempt to solve: Simplifying -42 + -13x + x2 = 0 Solving -42 + -13x + x2 = 0 Begin completing the square. Move the constant term to the right: Add '42' to each side of the equation. -42 + -13x + 42 + x2 = 0 + 42 Reorder the terms: -42 + 42 + -13x + x2 = 0 + 42 Combine like terms: -42 + 42 = 0 0 + -13x + x2 = 0 + 42 -13x + x2 = 0 + 42 Combine like terms: 0 + 42 = 42 -13x + x2 = 42 The x term is -13x. Take half its coefficient (-6.5). Square it (42.25) and add it to both sides. Add '42.25' to each side of the equation. -13x + 42.25 + x2 = 42 + 42.25 Reorder the terms: 42.25 + -13x + x2 = 42 + 42.25 Combine like terms: 42 + 42.25 = 84.25 42.25 + -13x + x2 = 84.25 Factor a perfect square on the left side: (x + -6.5)(x + -6.5) = 84.25 Calculate the square root of the right side: 9.178779875 Break this problem into two subproblems by setting (x + -6.5) equal to 9.178779875 and -9.178779875.

Subproblem 1

x + -6.5 = 9.178779875 Simplifying x + -6.5 = 9.178779875 Reorder the terms: -6.5 + x = 9.178779875 Solving -6.5 + x = 9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = 9.178779875 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = 9.178779875 + 6.5 x = 9.178779875 + 6.5 Combine like terms: 9.178779875 + 6.5 = 15.678779875 x = 15.678779875 Simplifying x = 15.678779875

Subproblem 2

x + -6.5 = -9.178779875 Simplifying x + -6.5 = -9.178779875 Reorder the terms: -6.5 + x = -9.178779875 Solving -6.5 + x = -9.178779875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '6.5' to each side of the equation. -6.5 + 6.5 + x = -9.178779875 + 6.5 Combine like terms: -6.5 + 6.5 = 0.0 0.0 + x = -9.178779875 + 6.5 x = -9.178779875 + 6.5 Combine like terms: -9.178779875 + 6.5 = -2.678779875 x = -2.678779875 Simplifying x = -2.678779875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.678779875, -2.678779875}

Solution

x = {15.678779875, -2.678779875}

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