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

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


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

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

Combine like terms: 12 + 7 = 19
19 + -7y + -7y + 8y2 + -12y2 = 0

Combine like terms: -7y + -7y = -14y
19 + -14y + 8y2 + -12y2 = 0

Combine like terms: 8y2 + -12y2 = -4y2
19 + -14y + -4y2 = 0

Solving
19 + -14y + -4y2 = 0

Solving for variable 'y'.

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

Divide each side by '-4'.
-4.75 + 3.5y + y2 = 0

Move the constant term to the right:

Add '4.75' to each side of the equation.
-4.75 + 3.5y + 4.75 + y2 = 0 + 4.75

Reorder the terms:
-4.75 + 4.75 + 3.5y + y2 = 0 + 4.75

Combine like terms: -4.75 + 4.75 = 0.00
0.00 + 3.5y + y2 = 0 + 4.75
3.5y + y2 = 0 + 4.75

Combine like terms: 0 + 4.75 = 4.75
3.5y + y2 = 4.75

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 = 4.75 + 3.0625

Reorder the terms:
3.0625 + 3.5y + y2 = 4.75 + 3.0625

Combine like terms: 4.75 + 3.0625 = 7.8125
3.0625 + 3.5y + y2 = 7.8125

Factor a perfect square on the left side:
(y + 1.75)(y + 1.75) = 7.8125

Calculate the square root of the right side: 2.795084972

Break this problem into two subproblems by setting 
(y + 1.75) equal to 2.795084972 and -2.795084972.

Subproblem 1

y + 1.75 = 2.795084972 Simplifying y + 1.75 = 2.795084972 Reorder the terms: 1.75 + y = 2.795084972 Solving 1.75 + y = 2.795084972 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 = 2.795084972 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = 2.795084972 + -1.75 y = 2.795084972 + -1.75 Combine like terms: 2.795084972 + -1.75 = 1.045084972 y = 1.045084972 Simplifying y = 1.045084972

Subproblem 2

y + 1.75 = -2.795084972 Simplifying y + 1.75 = -2.795084972 Reorder the terms: 1.75 + y = -2.795084972 Solving 1.75 + y = -2.795084972 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 = -2.795084972 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + y = -2.795084972 + -1.75 y = -2.795084972 + -1.75 Combine like terms: -2.795084972 + -1.75 = -4.545084972 y = -4.545084972 Simplifying y = -4.545084972

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.045084972, -4.545084972}

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