7y^2-42=0

Solution for 7y^2-42=0 equation:

Simplifying
7y2 + -42 = 0

Reorder the terms:
-42 + 7y2 = 0

Solving
-42 + 7y2 = 0

Solving for variable 'y'.

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

Add '42' to each side of the equation.
-42 + 42 + 7y2 = 0 + 42

Combine like terms: -42 + 42 = 0
0 + 7y2 = 0 + 42
7y2 = 0 + 42

Combine like terms: 0 + 42 = 42
7y2 = 42

Divide each side by '7'.
y2 = 6

Simplifying
y2 = 6

Take the square root of each side:
y = {-2.449489743, 2.449489743}