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Expansion of (x^2 - y^2)

Using a2-b2...

Question

Using $a^{2} - b^{2} = (a + b) (a - b)$ , find
$153^{2} - 147^{2}$

1800

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1600

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180

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2800

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Solution

The correct option is A $1800$
$153^{2} - 147^{2}$
$= (153 + 147) (153 - 147)$ ${U s i n g a^{2} - b^{2} = (a + b) (a - b)}$
$= 300 \times 6$
$= 1800$

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