(7y^2-2y+8)+(3y^2-3y-5)-(6y^2-6y-5)=

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Solution for (7y^2-2y+8)+(3y^2-3y-5)-(6y^2-6y-5)= equation:


Simplifying
(7y2 + -2y + 8) + (3y2 + -3y + -5) + -1(6y2 + -6y + -5) = 0

Reorder the terms:
(8 + -2y + 7y2) + (3y2 + -3y + -5) + -1(6y2 + -6y + -5) = 0

Remove parenthesis around (8 + -2y + 7y2)
8 + -2y + 7y2 + (3y2 + -3y + -5) + -1(6y2 + -6y + -5) = 0

Reorder the terms:
8 + -2y + 7y2 + (-5 + -3y + 3y2) + -1(6y2 + -6y + -5) = 0

Remove parenthesis around (-5 + -3y + 3y2)
8 + -2y + 7y2 + -5 + -3y + 3y2 + -1(6y2 + -6y + -5) = 0

Reorder the terms:
8 + -2y + 7y2 + -5 + -3y + 3y2 + -1(-5 + -6y + 6y2) = 0
8 + -2y + 7y2 + -5 + -3y + 3y2 + (-5 * -1 + -6y * -1 + 6y2 * -1) = 0
8 + -2y + 7y2 + -5 + -3y + 3y2 + (5 + 6y + -6y2) = 0

Reorder the terms:
8 + -5 + 5 + -2y + -3y + 6y + 7y2 + 3y2 + -6y2 = 0

Combine like terms: 8 + -5 = 3
3 + 5 + -2y + -3y + 6y + 7y2 + 3y2 + -6y2 = 0

Combine like terms: 3 + 5 = 8
8 + -2y + -3y + 6y + 7y2 + 3y2 + -6y2 = 0

Combine like terms: -2y + -3y = -5y
8 + -5y + 6y + 7y2 + 3y2 + -6y2 = 0

Combine like terms: -5y + 6y = 1y
8 + 1y + 7y2 + 3y2 + -6y2 = 0

Combine like terms: 7y2 + 3y2 = 10y2
8 + 1y + 10y2 + -6y2 = 0

Combine like terms: 10y2 + -6y2 = 4y2
8 + 1y + 4y2 = 0

Solving
8 + 1y + 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'.
2 + 0.25y + y2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 0.25y + -2 + y2 = 0 + -2

Reorder the terms:
2 + -2 + 0.25y + y2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 0.25y + y2 = 0 + -2
0.25y + y2 = 0 + -2

Combine like terms: 0 + -2 = -2
0.25y + y2 = -2

The y term is 0.25y.  Take half its coefficient (0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
0.25y + 0.015625 + y2 = -2 + 0.015625

Reorder the terms:
0.015625 + 0.25y + y2 = -2 + 0.015625

Combine like terms: -2 + 0.015625 = -1.984375
0.015625 + 0.25y + y2 = -1.984375

Factor a perfect square on the left side:
(y + 0.125)(y + 0.125) = -1.984375

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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