Question

43*37,Find the value using expansion formula.

Answer 1

=(40+3).(40-3)
=40*2-3*2
=1600-9
=1591

Answer 2

BONJOUR,
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$43 \times 37 \\ (40 + 3)(40 - 3) \\ by \: using \: idenity \: (x - y)(x + y) = x {}^{2} - y {}^{2} \\ \\ 40 {}^{2} - 3 {}^{2} \\ = 1600 - 9 \\ = 1591$