y^2-16+64-81=0

Solution for y^2-16+64-81=0 equation:

Simplifying
y2 + -16 + 64 + -81 = 0

Reorder the terms:
-16 + 64 + -81 + y2 = 0

Combine like terms: -16 + 64 = 48
48 + -81 + y2 = 0

Combine like terms: 48 + -81 = -33
-33 + y2 = 0

Solving
-33 + y2 = 0

Solving for variable 'y'.

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

Add '33' to each side of the equation.
-33 + 33 + y2 = 0 + 33

Combine like terms: -33 + 33 = 0
0 + y2 = 0 + 33
y2 = 0 + 33

Combine like terms: 0 + 33 = 33
y2 = 33

Simplifying
y2 = 33

Take the square root of each side:
y = {-5.744562647, 5.744562647}