5x^2-12x=91

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Solution for 5x^2-12x=91 equation:


Simplifying
5x2 + -12x = 91

Reorder the terms:
-12x + 5x2 = 91

Solving
-12x + 5x2 = 91

Solving for variable 'x'.

Reorder the terms:
-91 + -12x + 5x2 = 91 + -91

Combine like terms: 91 + -91 = 0
-91 + -12x + 5x2 = 0

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

Divide each side by '5'.
-18.2 + -2.4x + x2 = 0

Move the constant term to the right:

Add '18.2' to each side of the equation.
-18.2 + -2.4x + 18.2 + x2 = 0 + 18.2

Reorder the terms:
-18.2 + 18.2 + -2.4x + x2 = 0 + 18.2

Combine like terms: -18.2 + 18.2 = 0.0
0.0 + -2.4x + x2 = 0 + 18.2
-2.4x + x2 = 0 + 18.2

Combine like terms: 0 + 18.2 = 18.2
-2.4x + x2 = 18.2

The x term is -2.4x.  Take half its coefficient (-1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
-2.4x + 1.44 + x2 = 18.2 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 18.2 + 1.44

Combine like terms: 18.2 + 1.44 = 19.64
1.44 + -2.4x + x2 = 19.64

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 19.64

Calculate the square root of the right side: 4.431703961

Break this problem into two subproblems by setting 
(x + -1.2) equal to 4.431703961 and -4.431703961.

Subproblem 1

x + -1.2 = 4.431703961 Simplifying x + -1.2 = 4.431703961 Reorder the terms: -1.2 + x = 4.431703961 Solving -1.2 + x = 4.431703961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = 4.431703961 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 4.431703961 + 1.2 x = 4.431703961 + 1.2 Combine like terms: 4.431703961 + 1.2 = 5.631703961 x = 5.631703961 Simplifying x = 5.631703961

Subproblem 2

x + -1.2 = -4.431703961 Simplifying x + -1.2 = -4.431703961 Reorder the terms: -1.2 + x = -4.431703961 Solving -1.2 + x = -4.431703961 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.2' to each side of the equation. -1.2 + 1.2 + x = -4.431703961 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -4.431703961 + 1.2 x = -4.431703961 + 1.2 Combine like terms: -4.431703961 + 1.2 = -3.231703961 x = -3.231703961 Simplifying x = -3.231703961

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.631703961, -3.231703961}

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