-4y^2+9=0

Solution for -4y^2+9=0 equation:

Simplifying
-4y2 + 9 = 0

Reorder the terms:
9 + -4y2 = 0

Solving
9 + -4y2 = 0

Solving for variable 'y'.

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

Add '-9' to each side of the equation.
9 + -9 + -4y2 = 0 + -9

Combine like terms: 9 + -9 = 0
0 + -4y2 = 0 + -9
-4y2 = 0 + -9

Combine like terms: 0 + -9 = -9
-4y2 = -9

Divide each side by '-4'.
y2 = 2.25

Simplifying
y2 = 2.25

Take the square root of each side:
y = {-1.5, 1.5}