7y^2+21=49

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Solution for 7y^2+21=49 equation: 


Simplifying
7y2 + 21 = 49

Reorder the terms:
21 + 7y2 = 49

Solving
21 + 7y2 = 49

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 + 7y2 = 49 + -21

Combine like terms: 21 + -21 = 0
0 + 7y2 = 49 + -21
7y2 = 49 + -21

Combine like terms: 49 + -21 = 28
7y2 = 28

Divide each side by '7'.
y2 = 4

Simplifying
y2 = 4

Take the square root of each side:
y = {-2, 2}

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