y^2+15=21

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Solution for y^2+15=21 equation: 


Simplifying
y2 + 15 = 21

Reorder the terms:
15 + y2 = 21

Solving
15 + y2 = 21

Solving for variable 'y'.

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

Add '-15' to each side of the equation.
15 + -15 + y2 = 21 + -15

Combine like terms: 15 + -15 = 0
0 + y2 = 21 + -15
y2 = 21 + -15

Combine like terms: 21 + -15 = 6
y2 = 6

Simplifying
y2 = 6

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

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