5x^2+12x-36=104

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Solution for 5x^2+12x-36=104 equation:


Simplifying
5x2 + 12x + -36 = 104

Reorder the terms:
-36 + 12x + 5x2 = 104

Solving
-36 + 12x + 5x2 = 104

Solving for variable 'x'.

Reorder the terms:
-36 + -104 + 12x + 5x2 = 104 + -104

Combine like terms: -36 + -104 = -140
-140 + 12x + 5x2 = 104 + -104

Combine like terms: 104 + -104 = 0
-140 + 12x + 5x2 = 0

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

Divide each side by '5'.
-28 + 2.4x + x2 = 0

Move the constant term to the right:

Add '28' to each side of the equation.
-28 + 2.4x + 28 + x2 = 0 + 28

Reorder the terms:
-28 + 28 + 2.4x + x2 = 0 + 28

Combine like terms: -28 + 28 = 0
0 + 2.4x + x2 = 0 + 28
2.4x + x2 = 0 + 28

Combine like terms: 0 + 28 = 28
2.4x + x2 = 28

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 = 28 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 28 + 1.44

Combine like terms: 28 + 1.44 = 29.44
1.44 + 2.4x + x2 = 29.44

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 29.44

Calculate the square root of the right side: 5.425863987

Break this problem into two subproblems by setting 
(x + 1.2) equal to 5.425863987 and -5.425863987.

Subproblem 1

x + 1.2 = 5.425863987 Simplifying x + 1.2 = 5.425863987 Reorder the terms: 1.2 + x = 5.425863987 Solving 1.2 + x = 5.425863987 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 = 5.425863987 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 5.425863987 + -1.2 x = 5.425863987 + -1.2 Combine like terms: 5.425863987 + -1.2 = 4.225863987 x = 4.225863987 Simplifying x = 4.225863987

Subproblem 2

x + 1.2 = -5.425863987 Simplifying x + 1.2 = -5.425863987 Reorder the terms: 1.2 + x = -5.425863987 Solving 1.2 + x = -5.425863987 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 = -5.425863987 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -5.425863987 + -1.2 x = -5.425863987 + -1.2 Combine like terms: -5.425863987 + -1.2 = -6.625863987 x = -6.625863987 Simplifying x = -6.625863987

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.225863987, -6.625863987}

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