Question

L square - 16 l + 64 ​

Answer 1

$l {}^{2} - 16l + 64 \\ l {}^{2} - 8l - 8l + 64 \\ l(l - 8) - 8(l - 8) \\ (l - 8)(l - 8) \\ l - 8 = 0 \\ l = 8$

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