Compute the value of $72^{2} - 28^{2}$ .

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Solution

The given exprenion is

$72^{2} - 28^{2}$ which can be written as

$(72 + 28) (72 - 28) [a^{2} - b^{2} = (a + b) (a - b)]$

$= 100 \times 44$

$= 4400$

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