4x^2-15x-76=0

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Solution for 4x^2-15x-76=0 equation:


Simplifying
4x2 + -15x + -76 = 0

Reorder the terms:
-76 + -15x + 4x2 = 0

Solving
-76 + -15x + 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'.
-19 + -3.75x + x2 = 0

Move the constant term to the right:

Add '19' to each side of the equation.
-19 + -3.75x + 19 + x2 = 0 + 19

Reorder the terms:
-19 + 19 + -3.75x + x2 = 0 + 19

Combine like terms: -19 + 19 = 0
0 + -3.75x + x2 = 0 + 19
-3.75x + x2 = 0 + 19

Combine like terms: 0 + 19 = 19
-3.75x + x2 = 19

The x term is -3.75x.  Take half its coefficient (-1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
-3.75x + 3.515625 + x2 = 19 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 19 + 3.515625

Combine like terms: 19 + 3.515625 = 22.515625
3.515625 + -3.75x + x2 = 22.515625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 22.515625

Calculate the square root of the right side: 4.745063224

Break this problem into two subproblems by setting 
(x + -1.875) equal to 4.745063224 and -4.745063224.

Subproblem 1

x + -1.875 = 4.745063224 Simplifying x + -1.875 = 4.745063224 Reorder the terms: -1.875 + x = 4.745063224 Solving -1.875 + x = 4.745063224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = 4.745063224 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 4.745063224 + 1.875 x = 4.745063224 + 1.875 Combine like terms: 4.745063224 + 1.875 = 6.620063224 x = 6.620063224 Simplifying x = 6.620063224

Subproblem 2

x + -1.875 = -4.745063224 Simplifying x + -1.875 = -4.745063224 Reorder the terms: -1.875 + x = -4.745063224 Solving -1.875 + x = -4.745063224 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.875' to each side of the equation. -1.875 + 1.875 + x = -4.745063224 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -4.745063224 + 1.875 x = -4.745063224 + 1.875 Combine like terms: -4.745063224 + 1.875 = -2.870063224 x = -2.870063224 Simplifying x = -2.870063224

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.620063224, -2.870063224}

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