5x^2-36x-40=0

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Solution for 5x^2-36x-40=0 equation:


Simplifying
5x2 + -36x + -40 = 0

Reorder the terms:
-40 + -36x + 5x2 = 0

Solving
-40 + -36x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-8 + -7.2x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -7.2x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -7.2x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -7.2x + x2 = 0 + 8
-7.2x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-7.2x + x2 = 8

The x term is -7.2x.  Take half its coefficient (-3.6).
Square it (12.96) and add it to both sides.

Add '12.96' to each side of the equation.
-7.2x + 12.96 + x2 = 8 + 12.96

Reorder the terms:
12.96 + -7.2x + x2 = 8 + 12.96

Combine like terms: 8 + 12.96 = 20.96
12.96 + -7.2x + x2 = 20.96

Factor a perfect square on the left side:
(x + -3.6)(x + -3.6) = 20.96

Calculate the square root of the right side: 4.578209257

Break this problem into two subproblems by setting 
(x + -3.6) equal to 4.578209257 and -4.578209257.

Subproblem 1

x + -3.6 = 4.578209257 Simplifying x + -3.6 = 4.578209257 Reorder the terms: -3.6 + x = 4.578209257 Solving -3.6 + x = 4.578209257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = 4.578209257 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = 4.578209257 + 3.6 x = 4.578209257 + 3.6 Combine like terms: 4.578209257 + 3.6 = 8.178209257 x = 8.178209257 Simplifying x = 8.178209257

Subproblem 2

x + -3.6 = -4.578209257 Simplifying x + -3.6 = -4.578209257 Reorder the terms: -3.6 + x = -4.578209257 Solving -3.6 + x = -4.578209257 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.6' to each side of the equation. -3.6 + 3.6 + x = -4.578209257 + 3.6 Combine like terms: -3.6 + 3.6 = 0.0 0.0 + x = -4.578209257 + 3.6 x = -4.578209257 + 3.6 Combine like terms: -4.578209257 + 3.6 = -0.978209257 x = -0.978209257 Simplifying x = -0.978209257

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.178209257, -0.978209257}

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