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 = 0.677572232
x = 0.677572232

Simplifying
x = 0.677572232


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 = -4.427572232
x = -4.427572232

Simplifying
x = -4.427572232


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

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