Question

factorise

63x²y²-7 ​

Answer 1

$7(9x { \: }^{2} y { \: }^{2} - 1)$

$7((3xy) {}^{2} \: - (1) ^{2} \: )$

$7(3xy + 1) (3xy - 1)$

Answer 2

Answer:

ans. 7(3xy-1)(3xy+1)