y^2-84-84=0

Solution for y^2-84-84=0 equation:

Simplifying
y2 + -84 + -84 = 0

Reorder the terms:
-84 + -84 + y2 = 0

Combine like terms: -84 + -84 = -168
-168 + y2 = 0

Solving
-168 + y2 = 0

Solving for variable 'y'.

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

Add '168' to each side of the equation.
-168 + 168 + y2 = 0 + 168

Combine like terms: -168 + 168 = 0
0 + y2 = 0 + 168
y2 = 0 + 168

Combine like terms: 0 + 168 = 168
y2 = 168

Simplifying
y2 = 168

Take the square root of each side:
y = {-12.961481397, 12.961481397}