5x^2-12x-40=0

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Solution for 5x^2-12x-40=0 equation:


Simplifying
5x2 + -12x + -40 = 0

Reorder the terms:
-40 + -12x + 5x2 = 0

Solving
-40 + -12x + 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 + -2.4x + x2 = 0

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -2.4x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -2.4x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -2.4x + x2 = 0 + 8
-2.4x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-2.4x + x2 = 8

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 = 8 + 1.44

Reorder the terms:
1.44 + -2.4x + x2 = 8 + 1.44

Combine like terms: 8 + 1.44 = 9.44
1.44 + -2.4x + x2 = 9.44

Factor a perfect square on the left side:
(x + -1.2)(x + -1.2) = 9.44

Calculate the square root of the right side: 3.072458299

Break this problem into two subproblems by setting 
(x + -1.2) equal to 3.072458299 and -3.072458299.

Subproblem 1

x + -1.2 = 3.072458299 Simplifying x + -1.2 = 3.072458299 Reorder the terms: -1.2 + x = 3.072458299 Solving -1.2 + x = 3.072458299 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 = 3.072458299 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = 3.072458299 + 1.2 x = 3.072458299 + 1.2 Combine like terms: 3.072458299 + 1.2 = 4.272458299 x = 4.272458299 Simplifying x = 4.272458299

Subproblem 2

x + -1.2 = -3.072458299 Simplifying x + -1.2 = -3.072458299 Reorder the terms: -1.2 + x = -3.072458299 Solving -1.2 + x = -3.072458299 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 = -3.072458299 + 1.2 Combine like terms: -1.2 + 1.2 = 0.0 0.0 + x = -3.072458299 + 1.2 x = -3.072458299 + 1.2 Combine like terms: -3.072458299 + 1.2 = -1.872458299 x = -1.872458299 Simplifying x = -1.872458299

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.272458299, -1.872458299}

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