4x^2-15x-12=0

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Solution for 4x^2-15x-12=0 equation:


Simplifying
4x2 + -15x + -12 = 0

Reorder the terms:
-12 + -15x + 4x2 = 0

Solving
-12 + -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'.
-3 + -3.75x + x2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -3.75x + 3 + x2 = 0 + 3

Reorder the terms:
-3 + 3 + -3.75x + x2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -3.75x + x2 = 0 + 3
-3.75x + x2 = 0 + 3

Combine like terms: 0 + 3 = 3
-3.75x + x2 = 3

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 = 3 + 3.515625

Reorder the terms:
3.515625 + -3.75x + x2 = 3 + 3.515625

Combine like terms: 3 + 3.515625 = 6.515625
3.515625 + -3.75x + x2 = 6.515625

Factor a perfect square on the left side:
(x + -1.875)(x + -1.875) = 6.515625

Calculate the square root of the right side: 2.552572232

Break this problem into two subproblems by setting 
(x + -1.875) equal to 2.552572232 and -2.552572232.

Subproblem 1

x + -1.875 = 2.552572232 Simplifying x + -1.875 = 2.552572232 Reorder the terms: -1.875 + x = 2.552572232 Solving -1.875 + x = 2.552572232 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 = 2.552572232 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = 2.552572232 + 1.875 x = 2.552572232 + 1.875 Combine like terms: 2.552572232 + 1.875 = 4.427572232 x = 4.427572232 Simplifying x = 4.427572232

Subproblem 2

x + -1.875 = -2.552572232 Simplifying x + -1.875 = -2.552572232 Reorder the terms: -1.875 + x = -2.552572232 Solving -1.875 + x = -2.552572232 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 = -2.552572232 + 1.875 Combine like terms: -1.875 + 1.875 = 0.000 0.000 + x = -2.552572232 + 1.875 x = -2.552572232 + 1.875 Combine like terms: -2.552572232 + 1.875 = -0.677572232 x = -0.677572232 Simplifying x = -0.677572232

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.427572232, -0.677572232}

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