Factorise: 63 x^2 y^2-7 - Vidyadip

Question

Factorise:
$63 x^2 y^2-7$

✓

Answer

$=7\left(9 x^2 y^2-1\right)$
$=7\left((3 x y)^2-(1)^2\right)$
[according to the formula $a ^2- b ^2=( a + b )( a - b )$ ]
$=7(3 x y+1)(3 x y-1)$

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