4s^2-3s-12=0

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Solution for 4s^2-3s-12=0 equation:


Simplifying
4s2 + -3s + -12 = 0

Reorder the terms:
-12 + -3s + 4s2 = 0

Solving
-12 + -3s + 4s2 = 0

Solving for variable 's'.

Begin completing the square.  Divide all terms by
4 the coefficient of the squared term: 

Divide each side by '4'.
-3 + -0.75s + s2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + -0.75s + 3 + s2 = 0 + 3

Reorder the terms:
-3 + 3 + -0.75s + s2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + -0.75s + s2 = 0 + 3
-0.75s + s2 = 0 + 3

Combine like terms: 0 + 3 = 3
-0.75s + s2 = 3

The s term is -0.75s.  Take half its coefficient (-0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
-0.75s + 0.140625 + s2 = 3 + 0.140625

Reorder the terms:
0.140625 + -0.75s + s2 = 3 + 0.140625

Combine like terms: 3 + 0.140625 = 3.140625
0.140625 + -0.75s + s2 = 3.140625

Factor a perfect square on the left side:
(s + -0.375)(s + -0.375) = 3.140625

Calculate the square root of the right side: 1.77218086

Break this problem into two subproblems by setting 
(s + -0.375) equal to 1.77218086 and -1.77218086.

Subproblem 1

s + -0.375 = 1.77218086 Simplifying s + -0.375 = 1.77218086 Reorder the terms: -0.375 + s = 1.77218086 Solving -0.375 + s = 1.77218086 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + s = 1.77218086 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + s = 1.77218086 + 0.375 s = 1.77218086 + 0.375 Combine like terms: 1.77218086 + 0.375 = 2.14718086 s = 2.14718086 Simplifying s = 2.14718086

Subproblem 2

s + -0.375 = -1.77218086 Simplifying s + -0.375 = -1.77218086 Reorder the terms: -0.375 + s = -1.77218086 Solving -0.375 + s = -1.77218086 Solving for variable 's'. Move all terms containing s to the left, all other terms to the right. Add '0.375' to each side of the equation. -0.375 + 0.375 + s = -1.77218086 + 0.375 Combine like terms: -0.375 + 0.375 = 0.000 0.000 + s = -1.77218086 + 0.375 s = -1.77218086 + 0.375 Combine like terms: -1.77218086 + 0.375 = -1.39718086 s = -1.39718086 Simplifying s = -1.39718086

Solution

The solution to the problem is based on the solutions from the subproblems. s = {2.14718086, -1.39718086}

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