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

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

Simplifying
(9y2 + -8) + (9y2 + -9) = 0

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

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

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

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

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

Combine like terms: -8 + -9 = -17
-17 + 9y2 + 9y2 = 0

Combine like terms: 9y2 + 9y2 = 18y2
-17 + 18y2 = 0

Solving
-17 + 18y2 = 0

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '17' to each side of the equation.
-17 + 17 + 18y2 = 0 + 17

Combine like terms: -17 + 17 = 0
0 + 18y2 = 0 + 17
18y2 = 0 + 17

Combine like terms: 0 + 17 = 17
18y2 = 17

Divide each side by '18'.
y2 = 0.9444444444

Simplifying
y2 = 0.9444444444

Take the square root of each side:
y = {-0.971825316, 0.971825316}