4x^2-60x-135=0

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Solution for 4x^2-60x-135=0 equation:


Simplifying
4x2 + -60x + -135 = 0

Reorder the terms:
-135 + -60x + 4x2 = 0

Solving
-135 + -60x + 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'.
-33.75 + -15x + x2 = 0

Move the constant term to the right:

Add '33.75' to each side of the equation.
-33.75 + -15x + 33.75 + x2 = 0 + 33.75

Reorder the terms:
-33.75 + 33.75 + -15x + x2 = 0 + 33.75

Combine like terms: -33.75 + 33.75 = 0.00
0.00 + -15x + x2 = 0 + 33.75
-15x + x2 = 0 + 33.75

Combine like terms: 0 + 33.75 = 33.75
-15x + x2 = 33.75

The x term is -15x.  Take half its coefficient (-7.5).
Square it (56.25) and add it to both sides.

Add '56.25' to each side of the equation.
-15x + 56.25 + x2 = 33.75 + 56.25

Reorder the terms:
56.25 + -15x + x2 = 33.75 + 56.25

Combine like terms: 33.75 + 56.25 = 90
56.25 + -15x + x2 = 90

Factor a perfect square on the left side:
(x + -7.5)(x + -7.5) = 90

Calculate the square root of the right side: 9.486832981

Break this problem into two subproblems by setting 
(x + -7.5) equal to 9.486832981 and -9.486832981.

Subproblem 1

x + -7.5 = 9.486832981 Simplifying x + -7.5 = 9.486832981 Reorder the terms: -7.5 + x = 9.486832981 Solving -7.5 + x = 9.486832981 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = 9.486832981 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = 9.486832981 + 7.5 x = 9.486832981 + 7.5 Combine like terms: 9.486832981 + 7.5 = 16.986832981 x = 16.986832981 Simplifying x = 16.986832981

Subproblem 2

x + -7.5 = -9.486832981 Simplifying x + -7.5 = -9.486832981 Reorder the terms: -7.5 + x = -9.486832981 Solving -7.5 + x = -9.486832981 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7.5' to each side of the equation. -7.5 + 7.5 + x = -9.486832981 + 7.5 Combine like terms: -7.5 + 7.5 = 0.0 0.0 + x = -9.486832981 + 7.5 x = -9.486832981 + 7.5 Combine like terms: -9.486832981 + 7.5 = -1.986832981 x = -1.986832981 Simplifying x = -1.986832981

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.986832981, -1.986832981}

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