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Simplifying
a2 + 16 + -25 = 0
Reorder the terms:
16 + -25 + a2 = 0
Combine like terms: 16 + -25 = -9
-9 + a2 = 0
Solving
-9 + a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '9' to each side of the equation.
-9 + 9 + a2 = 0 + 9
Combine like terms: -9 + 9 = 0
0 + a2 = 0 + 9
a2 = 0 + 9
Combine like terms: 0 + 9 = 9
a2 = 9
Simplifying
a2 = 9
Take the square root of each side:
a = {-3, 3}
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