(3y^2-7y)-(9y^2-8y+5)=

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Solution for (3y^2-7y)-(9y^2-8y+5)= equation:


Simplifying
(3y2 + -7y) + -1(9y2 + -8y + 5) = 0

Reorder the terms:
(-7y + 3y2) + -1(9y2 + -8y + 5) = 0

Remove parenthesis around (-7y + 3y2)
-7y + 3y2 + -1(9y2 + -8y + 5) = 0

Reorder the terms:
-7y + 3y2 + -1(5 + -8y + 9y2) = 0
-7y + 3y2 + (5 * -1 + -8y * -1 + 9y2 * -1) = 0
-7y + 3y2 + (-5 + 8y + -9y2) = 0

Reorder the terms:
-5 + -7y + 8y + 3y2 + -9y2 = 0

Combine like terms: -7y + 8y = 1y
-5 + 1y + 3y2 + -9y2 = 0

Combine like terms: 3y2 + -9y2 = -6y2
-5 + 1y + -6y2 = 0

Solving
-5 + 1y + -6y2 = 0

Solving for variable 'y'.

Begin completing the square.  Divide all terms by
-6 the coefficient of the squared term: 

Divide each side by '-6'.
0.8333333333 + -0.1666666667y + y2 = 0

Move the constant term to the right:

Add '-0.8333333333' to each side of the equation.
0.8333333333 + -0.1666666667y + -0.8333333333 + y2 = 0 + -0.8333333333

Reorder the terms:
0.8333333333 + -0.8333333333 + -0.1666666667y + y2 = 0 + -0.8333333333

Combine like terms: 0.8333333333 + -0.8333333333 = 0.0000000000
0.0000000000 + -0.1666666667y + y2 = 0 + -0.8333333333
-0.1666666667y + y2 = 0 + -0.8333333333

Combine like terms: 0 + -0.8333333333 = -0.8333333333
-0.1666666667y + y2 = -0.8333333333

The y term is -0.1666666667y.  Take half its coefficient (-0.08333333335).
Square it (0.006944444447) and add it to both sides.

Add '0.006944444447' to each side of the equation.
-0.1666666667y + 0.006944444447 + y2 = -0.8333333333 + 0.006944444447

Reorder the terms:
0.006944444447 + -0.1666666667y + y2 = -0.8333333333 + 0.006944444447

Combine like terms: -0.8333333333 + 0.006944444447 = -0.826388888853
0.006944444447 + -0.1666666667y + y2 = -0.826388888853

Factor a perfect square on the left side:
(y + -0.08333333335)(y + -0.08333333335) = -0.826388888853

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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