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Simplifying
(a + -11)(a + 11) = 0
Reorder the terms:
(-11 + a)(a + 11) = 0
Reorder the terms:
(-11 + a)(11 + a) = 0
Multiply (-11 + a) * (11 + a)
(-11(11 + a) + a(11 + a)) = 0
((11 * -11 + a * -11) + a(11 + a)) = 0
((-121 + -11a) + a(11 + a)) = 0
(-121 + -11a + (11 * a + a * a)) = 0
(-121 + -11a + (11a + a2)) = 0
Combine like terms: -11a + 11a = 0
(-121 + 0 + a2) = 0
(-121 + a2) = 0
Solving
-121 + a2 = 0
Solving for variable 'a'.
Move all terms containing a to the left, all other terms to the right.
Add '121' to each side of the equation.
-121 + 121 + a2 = 0 + 121
Combine like terms: -121 + 121 = 0
0 + a2 = 0 + 121
a2 = 0 + 121
Combine like terms: 0 + 121 = 121
a2 = 121
Simplifying
a2 = 121
Take the square root of each side:
a = {-11, 11}
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