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Simplifying
(8 + a)(8 + -1a) = 0
Multiply (8 + a) * (8 + -1a)
(8(8 + -1a) + a(8 + -1a)) = 0
((8 * 8 + -1a * 8) + a(8 + -1a)) = 0
((64 + -8a) + a(8 + -1a)) = 0
(64 + -8a + (8 * a + -1a * a)) = 0
(64 + -8a + (8a + -1a2)) = 0
Combine like terms: -8a + 8a = 0
(64 + 0 + -1a2) = 0
(64 + -1a2) = 0
Solving
64 + -1a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '-64' to each side of the equation.
64 + -64 + -1a2 = 0 + -64
Combine like terms: 64 + -64 = 0
0 + -1a2 = 0 + -64
-1a2 = 0 + -64
Combine like terms: 0 + -64 = -64
-1a2 = -64
Divide each side by '-1'.
a2 = 64
Simplifying
a2 = 64
Take the square root of each side:
a = {-8, 8}
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