Question : What is the expansion of ($x$ + 11)($x$ – 11)?
Option 1: $x$2 + 11
Option 2: $x$2 – 121
Option 3: $x$2 + 121
Option 4: $x$2 – 11
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Correct Answer: $x$ 2 – 121
Solution : ($x$ + 11)($x$ – 11) = $x$ 2 – (11) 2 = $x$ 2 – 121 Hence, the correct answer is $x$ 2 – 121.
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