Instructions

What value should come in the place of question mark (?) in the following questions?

Question 82

$$(16)^{2}+(21)^{2}-(13)^{2}+?=(25)^{2}$$

Solution

First we calculate $$ 21^2 - 13^2 $$ through (a-b)(a+b) hence, it will be $$34 \times 8 = 272$$

Now answer will be = 625 - (272+256)

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