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Simplifying
7y2 + -4 = 21
Reorder the terms:
-4 + 7y2 = 21
Solving
-4 + 7y2 = 21
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '4' to each side of the equation.
-4 + 4 + 7y2 = 21 + 4
Combine like terms: -4 + 4 = 0
0 + 7y2 = 21 + 4
7y2 = 21 + 4
Combine like terms: 21 + 4 = 25
7y2 = 25
Divide each side by '7'.
y2 = 3.571428571
Simplifying
y2 = 3.571428571
Take the square root of each side:
y = {-1.889822365, 1.889822365}
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