=5x^2+20x-12

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


Simplifying
0 = 5x2 + 20x + -12

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

Solving
0 = -12 + 20x + 5x2

Solving for variable 'x'.

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

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

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

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

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

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

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

Move the constant term to the right:

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

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

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 4x + x2 = 0 + 2.4
4x + x2 = 0 + 2.4

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

The x term is 4x.  Take half its coefficient (2).
Square it (4) and add it to both sides.

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

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

Combine like terms: 2.4 + 4 = 6.4
4 + 4x + x2 = 6.4

Factor a perfect square on the left side:
(x + 2)(x + 2) = 6.4

Calculate the square root of the right side: 2.529822128

Break this problem into two subproblems by setting 
(x + 2) equal to 2.529822128 and -2.529822128.

Subproblem 1

x + 2 = 2.529822128 Simplifying x + 2 = 2.529822128 Reorder the terms: 2 + x = 2.529822128 Solving 2 + x = 2.529822128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = 2.529822128 + -2 Combine like terms: 2 + -2 = 0 0 + x = 2.529822128 + -2 x = 2.529822128 + -2 Combine like terms: 2.529822128 + -2 = 0.529822128 x = 0.529822128 Simplifying x = 0.529822128

Subproblem 2

x + 2 = -2.529822128 Simplifying x + 2 = -2.529822128 Reorder the terms: 2 + x = -2.529822128 Solving 2 + x = -2.529822128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + x = -2.529822128 + -2 Combine like terms: 2 + -2 = 0 0 + x = -2.529822128 + -2 x = -2.529822128 + -2 Combine like terms: -2.529822128 + -2 = -4.529822128 x = -4.529822128 Simplifying x = -4.529822128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.529822128, -4.529822128}

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