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Expansion of (x^2 - y^2)

Using a2 - ...

Question

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

A

1801

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B

1800

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C

1803

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D

1802

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Solution

The correct option is B $1800$
$(153)^{2} - (147)^{2}$
Using,
$a^{2} - b^{2} = (a + b) (a - b)$ we get,
$= (153 + 147) (153 - 147)$
$= 300 \times 6$
$= 1800$

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