31x39=
Ireally need help with this thx =D
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Q) value of 31 x 39
A) 31 x 39
= (30 + 1)(30+9)
Using identity, (x + a)(x + b) = x^2 + (a + b)x + ab
= 30^2 + (1 + 9) * 30 + 1 * 9
= 900 + 10 * 30 + 9
= 900 + 300 + 9
= 1209
Therefore, your answer is 1209.
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