Question

Evaluate the following by using suitable identities.
(28) sq​

Answer 1

Answer:

the answer is 784

Step-by-step explanation:

we can write 28 as 30 - 2.

Therefore, 28^2 = (30 - 2)^2

now using the identity (a-b)^2 = a^2 + b^2 - 2(a)(b)

(30 - 2)^2 = 30^2 + 2^2 - 2(30)(2)

               = 900 + 4 - 120

               = 904 - 120

               = 784

Hope it helps!!

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