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

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


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

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

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

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

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

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

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

Combine like terms: 9y2 + -7y2 = 2y2
1 + 2y2 = 0

Solving
1 + 2y2 = 0

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 + 2y2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + 2y2 = 0 + -1
2y2 = 0 + -1

Combine like terms: 0 + -1 = -1
2y2 = -1

Divide each side by '2'.
y2 = -0.5

Simplifying
y2 = -0.5

Reorder the terms:
0.5 + y2 = -0.5 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.5 + y2 = 0.0

The solution to this equation could not be determined.

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