4x^2-9x-60=0

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Solution for 4x^2-9x-60=0 equation:


Simplifying
4x2 + -9x + -60 = 0

Reorder the terms:
-60 + -9x + 4x2 = 0

Solving
-60 + -9x + 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'.
-15 + -2.25x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -2.25x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -2.25x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -2.25x + x2 = 0 + 15
-2.25x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-2.25x + x2 = 15

The x term is -2.25x.  Take half its coefficient (-1.125).
Square it (1.265625) and add it to both sides.

Add '1.265625' to each side of the equation.
-2.25x + 1.265625 + x2 = 15 + 1.265625

Reorder the terms:
1.265625 + -2.25x + x2 = 15 + 1.265625

Combine like terms: 15 + 1.265625 = 16.265625
1.265625 + -2.25x + x2 = 16.265625

Factor a perfect square on the left side:
(x + -1.125)(x + -1.125) = 16.265625

Calculate the square root of the right side: 4.033066451

Break this problem into two subproblems by setting 
(x + -1.125) equal to 4.033066451 and -4.033066451.

Subproblem 1

x + -1.125 = 4.033066451 Simplifying x + -1.125 = 4.033066451 Reorder the terms: -1.125 + x = 4.033066451 Solving -1.125 + x = 4.033066451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = 4.033066451 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = 4.033066451 + 1.125 x = 4.033066451 + 1.125 Combine like terms: 4.033066451 + 1.125 = 5.158066451 x = 5.158066451 Simplifying x = 5.158066451

Subproblem 2

x + -1.125 = -4.033066451 Simplifying x + -1.125 = -4.033066451 Reorder the terms: -1.125 + x = -4.033066451 Solving -1.125 + x = -4.033066451 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.125' to each side of the equation. -1.125 + 1.125 + x = -4.033066451 + 1.125 Combine like terms: -1.125 + 1.125 = 0.000 0.000 + x = -4.033066451 + 1.125 x = -4.033066451 + 1.125 Combine like terms: -4.033066451 + 1.125 = -2.908066451 x = -2.908066451 Simplifying x = -2.908066451

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.158066451, -2.908066451}

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