Question

Evalute 27x13 by using suitable identity with out actual multiplication

Answer 1

Step-by-step explanation:

27*13=(20+7)(20-7)

$(x + y)(x - y) = x {}^{2} - y {}^{2}$

$(20 + 7)(20 - 7) = 20 {}^{2} - 7 {}^{2} \\ = 400 - 49 \\ = 351$