(5y^2-2y-4)+(9y^2-2y+4)-(-7y^2+6y-3)=

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Solution for (5y^2-2y-4)+(9y^2-2y+4)-(-7y^2+6y-3)= equation:


Simplifying
(5y2 + -2y + -4) + (9y2 + -2y + 4) + -1(-7y2 + 6y + -3) = 0

Reorder the terms:
(-4 + -2y + 5y2) + (9y2 + -2y + 4) + -1(-7y2 + 6y + -3) = 0

Remove parenthesis around (-4 + -2y + 5y2)
-4 + -2y + 5y2 + (9y2 + -2y + 4) + -1(-7y2 + 6y + -3) = 0

Reorder the terms:
-4 + -2y + 5y2 + (4 + -2y + 9y2) + -1(-7y2 + 6y + -3) = 0

Remove parenthesis around (4 + -2y + 9y2)
-4 + -2y + 5y2 + 4 + -2y + 9y2 + -1(-7y2 + 6y + -3) = 0

Reorder the terms:
-4 + -2y + 5y2 + 4 + -2y + 9y2 + -1(-3 + 6y + -7y2) = 0
-4 + -2y + 5y2 + 4 + -2y + 9y2 + (-3 * -1 + 6y * -1 + -7y2 * -1) = 0
-4 + -2y + 5y2 + 4 + -2y + 9y2 + (3 + -6y + 7y2) = 0

Reorder the terms:
-4 + 4 + 3 + -2y + -2y + -6y + 5y2 + 9y2 + 7y2 = 0

Combine like terms: -4 + 4 = 0
0 + 3 + -2y + -2y + -6y + 5y2 + 9y2 + 7y2 = 0
3 + -2y + -2y + -6y + 5y2 + 9y2 + 7y2 = 0

Combine like terms: -2y + -2y = -4y
3 + -4y + -6y + 5y2 + 9y2 + 7y2 = 0

Combine like terms: -4y + -6y = -10y
3 + -10y + 5y2 + 9y2 + 7y2 = 0

Combine like terms: 5y2 + 9y2 = 14y2
3 + -10y + 14y2 + 7y2 = 0

Combine like terms: 14y2 + 7y2 = 21y2
3 + -10y + 21y2 = 0

Solving
3 + -10y + 21y2 = 0

Solving for variable 'y'.

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

Divide each side by '21'.
0.1428571429 + -0.4761904762y + y2 = 0

Move the constant term to the right:

Add '-0.1428571429' to each side of the equation.
0.1428571429 + -0.4761904762y + -0.1428571429 + y2 = 0 + -0.1428571429

Reorder the terms:
0.1428571429 + -0.1428571429 + -0.4761904762y + y2 = 0 + -0.1428571429

Combine like terms: 0.1428571429 + -0.1428571429 = 0.0000000000
0.0000000000 + -0.4761904762y + y2 = 0 + -0.1428571429
-0.4761904762y + y2 = 0 + -0.1428571429

Combine like terms: 0 + -0.1428571429 = -0.1428571429
-0.4761904762y + y2 = -0.1428571429

The y term is -0.4761904762y.  Take half its coefficient (-0.2380952381).
Square it (0.05668934241) and add it to both sides.

Add '0.05668934241' to each side of the equation.
-0.4761904762y + 0.05668934241 + y2 = -0.1428571429 + 0.05668934241

Reorder the terms:
0.05668934241 + -0.4761904762y + y2 = -0.1428571429 + 0.05668934241

Combine like terms: -0.1428571429 + 0.05668934241 = -0.08616780049
0.05668934241 + -0.4761904762y + y2 = -0.08616780049

Factor a perfect square on the left side:
(y + -0.2380952381)(y + -0.2380952381) = -0.08616780049

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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