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Simplifying
7a2 + -63 = 0
Reorder the terms:
-63 + 7a2 = 0
Solving
-63 + 7a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '63' to each side of the equation.
-63 + 63 + 7a2 = 0 + 63
Combine like terms: -63 + 63 = 0
0 + 7a2 = 0 + 63
7a2 = 0 + 63
Combine like terms: 0 + 63 = 63
7a2 = 63
Divide each side by '7'.
a2 = 9
Simplifying
a2 = 9
Take the square root of each side:
a = {-3, 3}
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