7y^2-40=0

Solution for 7y^2-40=0 equation:

Simplifying
7y2 + -40 = 0

Reorder the terms:
-40 + 7y2 = 0

Solving
-40 + 7y2 = 0

Solving for variable 'y'.

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

Add '40' to each side of the equation.
-40 + 40 + 7y2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + 7y2 = 0 + 40
7y2 = 0 + 40

Combine like terms: 0 + 40 = 40
7y2 = 40

Divide each side by '7'.
y2 = 5.714285714

Simplifying
y2 = 5.714285714

Take the square root of each side:
y = {-2.390457219, 2.390457219}