7y^2+65y-12=0

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Solution for 7y^2+65y-12=0 equation:


Simplifying
7y2 + 65y + -12 = 0

Reorder the terms:
-12 + 65y + 7y2 = 0

Solving
-12 + 65y + 7y2 = 0

Solving for variable 'y'.

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

Divide each side by '7'.
-1.714285714 + 9.285714286y + y2 = 0

Move the constant term to the right:

Add '1.714285714' to each side of the equation.
-1.714285714 + 9.285714286y + 1.714285714 + y2 = 0 + 1.714285714

Reorder the terms:
-1.714285714 + 1.714285714 + 9.285714286y + y2 = 0 + 1.714285714

Combine like terms: -1.714285714 + 1.714285714 = 0.000000000
0.000000000 + 9.285714286y + y2 = 0 + 1.714285714
9.285714286y + y2 = 0 + 1.714285714

Combine like terms: 0 + 1.714285714 = 1.714285714
9.285714286y + y2 = 1.714285714

The y term is 9.285714286y.  Take half its coefficient (4.642857143).
Square it (21.55612245) and add it to both sides.

Add '21.55612245' to each side of the equation.
9.285714286y + 21.55612245 + y2 = 1.714285714 + 21.55612245

Reorder the terms:
21.55612245 + 9.285714286y + y2 = 1.714285714 + 21.55612245

Combine like terms: 1.714285714 + 21.55612245 = 23.270408164
21.55612245 + 9.285714286y + y2 = 23.270408164

Factor a perfect square on the left side:
(y + 4.642857143)(y + 4.642857143) = 23.270408164

Calculate the square root of the right side: 4.823941144

Break this problem into two subproblems by setting 
(y + 4.642857143) equal to 4.823941144 and -4.823941144.

Subproblem 1

y + 4.642857143 = 4.823941144 Simplifying y + 4.642857143 = 4.823941144 Reorder the terms: 4.642857143 + y = 4.823941144 Solving 4.642857143 + y = 4.823941144 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.642857143' to each side of the equation. 4.642857143 + -4.642857143 + y = 4.823941144 + -4.642857143 Combine like terms: 4.642857143 + -4.642857143 = 0.000000000 0.000000000 + y = 4.823941144 + -4.642857143 y = 4.823941144 + -4.642857143 Combine like terms: 4.823941144 + -4.642857143 = 0.181084001 y = 0.181084001 Simplifying y = 0.181084001

Subproblem 2

y + 4.642857143 = -4.823941144 Simplifying y + 4.642857143 = -4.823941144 Reorder the terms: 4.642857143 + y = -4.823941144 Solving 4.642857143 + y = -4.823941144 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-4.642857143' to each side of the equation. 4.642857143 + -4.642857143 + y = -4.823941144 + -4.642857143 Combine like terms: 4.642857143 + -4.642857143 = 0.000000000 0.000000000 + y = -4.823941144 + -4.642857143 y = -4.823941144 + -4.642857143 Combine like terms: -4.823941144 + -4.642857143 = -9.466798287 y = -9.466798287 Simplifying y = -9.466798287

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.181084001, -9.466798287}

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