Question 86 (x)

Using suitable identities, evaluate the following:

$104 \times 97$

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Solution

We have,
$104 \times 97 = (100 + 4) (100 - 3) = (100)^{2} + (4 - 3) 100 + 4 \times (- 3) = 10000 + 100 - 12$
$= 10088$ [using the identity, $(x + a) (x + b) = x^{2} + (a + b) x + a b$ ]

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