5x^2+45x-12=0

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Solution for 5x^2+45x-12=0 equation:


Simplifying
5x2 + 45x + -12 = 0

Reorder the terms:
-12 + 45x + 5x2 = 0

Solving
-12 + 45x + 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'.
-2.4 + 9x + x2 = 0

Move the constant term to the right:

Add '2.4' to each side of the equation.
-2.4 + 9x + 2.4 + x2 = 0 + 2.4

Reorder the terms:
-2.4 + 2.4 + 9x + x2 = 0 + 2.4

Combine like terms: -2.4 + 2.4 = 0.0
0.0 + 9x + x2 = 0 + 2.4
9x + x2 = 0 + 2.4

Combine like terms: 0 + 2.4 = 2.4
9x + x2 = 2.4

The x term is 9x.  Take half its coefficient (4.5).
Square it (20.25) and add it to both sides.

Add '20.25' to each side of the equation.
9x + 20.25 + x2 = 2.4 + 20.25

Reorder the terms:
20.25 + 9x + x2 = 2.4 + 20.25

Combine like terms: 2.4 + 20.25 = 22.65
20.25 + 9x + x2 = 22.65

Factor a perfect square on the left side:
(x + 4.5)(x + 4.5) = 22.65

Calculate the square root of the right side: 4.759201614

Break this problem into two subproblems by setting 
(x + 4.5) equal to 4.759201614 and -4.759201614.

Subproblem 1

x + 4.5 = 4.759201614 Simplifying x + 4.5 = 4.759201614 Reorder the terms: 4.5 + x = 4.759201614 Solving 4.5 + x = 4.759201614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = 4.759201614 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = 4.759201614 + -4.5 x = 4.759201614 + -4.5 Combine like terms: 4.759201614 + -4.5 = 0.259201614 x = 0.259201614 Simplifying x = 0.259201614

Subproblem 2

x + 4.5 = -4.759201614 Simplifying x + 4.5 = -4.759201614 Reorder the terms: 4.5 + x = -4.759201614 Solving 4.5 + x = -4.759201614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.5' to each side of the equation. 4.5 + -4.5 + x = -4.759201614 + -4.5 Combine like terms: 4.5 + -4.5 = 0.0 0.0 + x = -4.759201614 + -4.5 x = -4.759201614 + -4.5 Combine like terms: -4.759201614 + -4.5 = -9.259201614 x = -9.259201614 Simplifying x = -9.259201614

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.259201614, -9.259201614}

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