Question

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Answer 1

Answer:

(l+A)^2-3A

${l}^{2} + {a}^{2} + 2al - 3a \\ \\ {l}^{2} + a + 2al - 3a \\ \\ = {l}^{2} + 2al - 2a \\ \\ l(l + 2a) - 2a = 0 \\ = l$

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