4x^2-12x-45=0

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Solution for 4x^2-12x-45=0 equation:


Simplifying
4x2 + -12x + -45 = 0

Reorder the terms:
-45 + -12x + 4x2 = 0

Solving
-45 + -12x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-11.25 + -3x + x2 = 0

Move the constant term to the right:

Add '11.25' to each side of the equation.
-11.25 + -3x + 11.25 + x2 = 0 + 11.25

Reorder the terms:
-11.25 + 11.25 + -3x + x2 = 0 + 11.25

Combine like terms: -11.25 + 11.25 = 0.00
0.00 + -3x + x2 = 0 + 11.25
-3x + x2 = 0 + 11.25

Combine like terms: 0 + 11.25 = 11.25
-3x + x2 = 11.25

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 11.25 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 11.25 + 2.25

Combine like terms: 11.25 + 2.25 = 13.5
2.25 + -3x + x2 = 13.5

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 13.5

Calculate the square root of the right side: 3.674234614

Break this problem into two subproblems by setting 
(x + -1.5) equal to 3.674234614 and -3.674234614.

Subproblem 1

x + -1.5 = 3.674234614 Simplifying x + -1.5 = 3.674234614 Reorder the terms: -1.5 + x = 3.674234614 Solving -1.5 + x = 3.674234614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 3.674234614 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 3.674234614 + 1.5 x = 3.674234614 + 1.5 Combine like terms: 3.674234614 + 1.5 = 5.174234614 x = 5.174234614 Simplifying x = 5.174234614

Subproblem 2

x + -1.5 = -3.674234614 Simplifying x + -1.5 = -3.674234614 Reorder the terms: -1.5 + x = -3.674234614 Solving -1.5 + x = -3.674234614 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -3.674234614 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -3.674234614 + 1.5 x = -3.674234614 + 1.5 Combine like terms: -3.674234614 + 1.5 = -2.174234614 x = -2.174234614 Simplifying x = -2.174234614

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.174234614, -2.174234614}

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