0=5x^2+12x-20

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Solution for 0=5x^2+12x-20 equation:


Simplifying
0 = 5x2 + 12x + -20

Reorder the terms:
0 = -20 + 12x + 5x2

Solving
0 = -20 + 12x + 5x2

Solving for variable 'x'.

Combine like terms: 0 + 20 = 20
20 + -12x + -5x2 = -20 + 12x + 5x2 + 20 + -12x + -5x2

Reorder the terms:
20 + -12x + -5x2 = -20 + 20 + 12x + -12x + 5x2 + -5x2

Combine like terms: -20 + 20 = 0
20 + -12x + -5x2 = 0 + 12x + -12x + 5x2 + -5x2
20 + -12x + -5x2 = 12x + -12x + 5x2 + -5x2

Combine like terms: 12x + -12x = 0
20 + -12x + -5x2 = 0 + 5x2 + -5x2
20 + -12x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
20 + -12x + -5x2 = 0

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

Divide each side by '-5'.
-4 + 2.4x + x2 = 0

Move the constant term to the right:

Add '4' to each side of the equation.
-4 + 2.4x + 4 + x2 = 0 + 4

Reorder the terms:
-4 + 4 + 2.4x + x2 = 0 + 4

Combine like terms: -4 + 4 = 0
0 + 2.4x + x2 = 0 + 4
2.4x + x2 = 0 + 4

Combine like terms: 0 + 4 = 4
2.4x + x2 = 4

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 = 4 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 4 + 1.44

Combine like terms: 4 + 1.44 = 5.44
1.44 + 2.4x + x2 = 5.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 5.44

Calculate the square root of the right side: 2.332380758

Break this problem into two subproblems by setting 
(x + 1.2) equal to 2.332380758 and -2.332380758.

Subproblem 1

x + 1.2 = 2.332380758 Simplifying x + 1.2 = 2.332380758 Reorder the terms: 1.2 + x = 2.332380758 Solving 1.2 + x = 2.332380758 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 = 2.332380758 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 2.332380758 + -1.2 x = 2.332380758 + -1.2 Combine like terms: 2.332380758 + -1.2 = 1.132380758 x = 1.132380758 Simplifying x = 1.132380758

Subproblem 2

x + 1.2 = -2.332380758 Simplifying x + 1.2 = -2.332380758 Reorder the terms: 1.2 + x = -2.332380758 Solving 1.2 + x = -2.332380758 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 = -2.332380758 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -2.332380758 + -1.2 x = -2.332380758 + -1.2 Combine like terms: -2.332380758 + -1.2 = -3.532380758 x = -3.532380758 Simplifying x = -3.532380758

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.132380758, -3.532380758}

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