Question

73*67Find the value using expansion formula.

Answer 1

BONJOUR,
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$73 \times 67 \\ (70 + 3)(70 - 3) \\ by \: using \: identity \: \\ (x + y)(x - y) = x {}^{2} - y {}^{2} \\ \\ 70 {}^{2} - 3 {}^{2} \\ = 4900 - 9 \\ = 4891$