2x^2-7x=136

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Solution for 2x^2-7x=136 equation:


Simplifying
2x2 + -7x = 136

Reorder the terms:
-7x + 2x2 = 136

Solving
-7x + 2x2 = 136

Solving for variable 'x'.

Reorder the terms:
-136 + -7x + 2x2 = 136 + -136

Combine like terms: 136 + -136 = 0
-136 + -7x + 2x2 = 0

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

Divide each side by '2'.
-68 + -3.5x + x2 = 0

Move the constant term to the right:

Add '68' to each side of the equation.
-68 + -3.5x + 68 + x2 = 0 + 68

Reorder the terms:
-68 + 68 + -3.5x + x2 = 0 + 68

Combine like terms: -68 + 68 = 0
0 + -3.5x + x2 = 0 + 68
-3.5x + x2 = 0 + 68

Combine like terms: 0 + 68 = 68
-3.5x + x2 = 68

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 68 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 68 + 3.0625

Combine like terms: 68 + 3.0625 = 71.0625
3.0625 + -3.5x + x2 = 71.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 71.0625

Calculate the square root of the right side: 8.42985765

Break this problem into two subproblems by setting 
(x + -1.75) equal to 8.42985765 and -8.42985765.

Subproblem 1

x + -1.75 = 8.42985765 Simplifying x + -1.75 = 8.42985765 Reorder the terms: -1.75 + x = 8.42985765 Solving -1.75 + x = 8.42985765 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 8.42985765 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 8.42985765 + 1.75 x = 8.42985765 + 1.75 Combine like terms: 8.42985765 + 1.75 = 10.17985765 x = 10.17985765 Simplifying x = 10.17985765

Subproblem 2

x + -1.75 = -8.42985765 Simplifying x + -1.75 = -8.42985765 Reorder the terms: -1.75 + x = -8.42985765 Solving -1.75 + x = -8.42985765 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -8.42985765 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -8.42985765 + 1.75 x = -8.42985765 + 1.75 Combine like terms: -8.42985765 + 1.75 = -6.67985765 x = -6.67985765 Simplifying x = -6.67985765

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.17985765, -6.67985765}

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