y^2+-21=-4

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Solution for y^2+-21=-4 equation: 


Simplifying
y2 + -21 = -4

Reorder the terms:
-21 + y2 = -4

Solving
-21 + y2 = -4

Solving for variable 'y'.

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

Add '21' to each side of the equation.
-21 + 21 + y2 = -4 + 21

Combine like terms: -21 + 21 = 0
0 + y2 = -4 + 21
y2 = -4 + 21

Combine like terms: -4 + 21 = 17
y2 = 17

Simplifying
y2 = 17

Take the square root of each side:
y = {-4.123105626, 4.123105626}

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