2y^2+7y-12=0

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Solution for 2y^2+7y-12=0 equation:


Simplifying
2y2 + 7y + -12 = 0

Reorder the terms:
-12 + 7y + 2y2 = 0

Solving
-12 + 7y + 2y2 = 0

Solving for variable 'y'.

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

Divide each side by '2'.
-6 + 3.5y + y2 = 0

Move the constant term to the right:

Add '6' to each side of the equation.
-6 + 3.5y + 6 + y2 = 0 + 6

Reorder the terms:
-6 + 6 + 3.5y + y2 = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 3.5y + y2 = 0 + 6
3.5y + y2 = 0 + 6

Combine like terms: 0 + 6 = 6
3.5y + y2 = 6

The y term is 3.5y.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5y + 3.0625 + y2 = 6 + 3.0625

Reorder the terms:
3.0625 + 3.5y + y2 = 6 + 3.0625

Combine like terms: 6 + 3.0625 = 9.0625
3.0625 + 3.5y + y2 = 9.0625

Factor a perfect square on the left side:
(y + 1.75)(y + 1.75) = 9.0625

Calculate the square root of the right side: 3.010398645

Break this problem into two subproblems by setting 
(y + 1.75) equal to 3.010398645 and -3.010398645.

Subproblem 1

y + 1.75 = 3.010398645 Simplifying y + 1.75 = 3.010398645 Reorder the terms: 1.75 + y = 3.010398645 Solving 1.75 + y = 3.010398645 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = 3.010398645 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 3.010398645 + -1.75 y = 3.010398645 + -1.75 Combine like terms: 3.010398645 + -1.75 = 1.260398645 y = 1.260398645 Simplifying y = 1.260398645

Subproblem 2

y + 1.75 = -3.010398645 Simplifying y + 1.75 = -3.010398645 Reorder the terms: 1.75 + y = -3.010398645 Solving 1.75 + y = -3.010398645 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + y = -3.010398645 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -3.010398645 + -1.75 y = -3.010398645 + -1.75 Combine like terms: -3.010398645 + -1.75 = -4.760398645 y = -4.760398645 Simplifying y = -4.760398645

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.260398645, -4.760398645}

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