4x^2+5x-60=0

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Solution for 4x^2+5x-60=0 equation:


Simplifying
4x2 + 5x + -60 = 0

Reorder the terms:
-60 + 5x + 4x2 = 0

Solving
-60 + 5x + 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 + 1.25x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + 1.25x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + 1.25x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + 1.25x + x2 = 0 + 15
1.25x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
1.25x + x2 = 15

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 15 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 15 + 0.390625

Combine like terms: 15 + 0.390625 = 15.390625
0.390625 + 1.25x + x2 = 15.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 15.390625

Calculate the square root of the right side: 3.923088707

Break this problem into two subproblems by setting 
(x + 0.625) equal to 3.923088707 and -3.923088707.

Subproblem 1

x + 0.625 = 3.923088707 Simplifying x + 0.625 = 3.923088707 Reorder the terms: 0.625 + x = 3.923088707 Solving 0.625 + x = 3.923088707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 3.923088707 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 3.923088707 + -0.625 x = 3.923088707 + -0.625 Combine like terms: 3.923088707 + -0.625 = 3.298088707 x = 3.298088707 Simplifying x = 3.298088707

Subproblem 2

x + 0.625 = -3.923088707 Simplifying x + 0.625 = -3.923088707 Reorder the terms: 0.625 + x = -3.923088707 Solving 0.625 + x = -3.923088707 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -3.923088707 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -3.923088707 + -0.625 x = -3.923088707 + -0.625 Combine like terms: -3.923088707 + -0.625 = -4.548088707 x = -4.548088707 Simplifying x = -4.548088707

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.298088707, -4.548088707}

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