Question

Evaluate 27x13 with suitable identity with out actual multiplication

Answer 1

27 * 13 = 351  Evaluated 27x13 with (a + b)(a - b) = a² -b² identity

Step-by-step explanation:

We need to Evaluate 27x13 with suitable identity

27 = 20 + 7

13 = 20 - 7

so we can use here

(x + y)(x - y) = x² - y²

x = 20

y = 7

27 * 13

= (20 + 7)(20 - 7)

= 20² - 7²

= 400 - 49

= 351

27 * 13 = 351

Evaluated 27x13 with (a + b)(a - b) = a² -b² identity

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