Using a suitable identity, evaluate the following:

$(69.3)^{2} - (30.7)^{2}$

386

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3860

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38.6

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38600

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Solution

The correct option is B 3860
We know, $(a + b) (a - b) = a^{2} - b^{2}$ .
So,
$(69.3)^{2} - (30.7)^{2} = (69.3 + 30.7) (69.3 - 30.7) = 100 \times 38.6 = 3860$

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