Question

(a+7)²= ......... +14a+49,Fill in the blank.

Answer 1

a^2+14a+49
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Answer 2

BONJOUR,
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$(a + 7) {}^{2} \\ = a {}^{2} + 2 \times a \times 7 + 7 {}^{2} \\ = a {}^{2} + 14a + 49$