8y^2-7y+12-15y^2-7y+3=

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Solution for 8y^2-7y+12-15y^2-7y+3= equation:


Simplifying
8y2 + -7y + 12 + -15y2 + -7y + 3 = 0

Reorder the terms:
12 + 3 + -7y + -7y + 8y2 + -15y2 = 0

Combine like terms: 12 + 3 = 15
15 + -7y + -7y + 8y2 + -15y2 = 0

Combine like terms: -7y + -7y = -14y
15 + -14y + 8y2 + -15y2 = 0

Combine like terms: 8y2 + -15y2 = -7y2
15 + -14y + -7y2 = 0

Solving
15 + -14y + -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'.
-2.142857143 + 2y + y2 = 0

Move the constant term to the right:

Add '2.142857143' to each side of the equation.
-2.142857143 + 2y + 2.142857143 + y2 = 0 + 2.142857143

Reorder the terms:
-2.142857143 + 2.142857143 + 2y + y2 = 0 + 2.142857143

Combine like terms: -2.142857143 + 2.142857143 = 0.000000000
0.000000000 + 2y + y2 = 0 + 2.142857143
2y + y2 = 0 + 2.142857143

Combine like terms: 0 + 2.142857143 = 2.142857143
2y + y2 = 2.142857143

The y term is 2y.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2y + 1 + y2 = 2.142857143 + 1

Reorder the terms:
1 + 2y + y2 = 2.142857143 + 1

Combine like terms: 2.142857143 + 1 = 3.142857143
1 + 2y + y2 = 3.142857143

Factor a perfect square on the left side:
(y + 1)(y + 1) = 3.142857143

Calculate the square root of the right side: 1.772810521

Break this problem into two subproblems by setting 
(y + 1) equal to 1.772810521 and -1.772810521.

Subproblem 1

y + 1 = 1.772810521 Simplifying y + 1 = 1.772810521 Reorder the terms: 1 + y = 1.772810521 Solving 1 + y = 1.772810521 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = 1.772810521 + -1 Combine like terms: 1 + -1 = 0 0 + y = 1.772810521 + -1 y = 1.772810521 + -1 Combine like terms: 1.772810521 + -1 = 0.772810521 y = 0.772810521 Simplifying y = 0.772810521

Subproblem 2

y + 1 = -1.772810521 Simplifying y + 1 = -1.772810521 Reorder the terms: 1 + y = -1.772810521 Solving 1 + y = -1.772810521 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + y = -1.772810521 + -1 Combine like terms: 1 + -1 = 0 0 + y = -1.772810521 + -1 y = -1.772810521 + -1 Combine like terms: -1.772810521 + -1 = -2.772810521 y = -2.772810521 Simplifying y = -2.772810521

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.772810521, -2.772810521}

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