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Simplifying
5a2 + 7 = 87
Reorder the terms:
7 + 5a2 = 87
Solving
7 + 5a2 = 87
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '-7' to each side of the equation.
7 + -7 + 5a2 = 87 + -7
Combine like terms: 7 + -7 = 0
0 + 5a2 = 87 + -7
5a2 = 87 + -7
Combine like terms: 87 + -7 = 80
5a2 = 80
Divide each side by '5'.
a2 = 16
Simplifying
a2 = 16
Take the square root of each side:
a = {-4, 4}
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