Question

1. Factorize: a)m² -9 b) 81 - x²y²

plz answer in sum ​

Answer 1

Answer:

m²-9

= m²-3³

= (m+3)(m-3)

81-x²y²

= 9²-(xy)²

= (9+xy)(9-xy)

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Answer 2

a)

${m}^{2} - 9 \\ {(m)}^{2} - {(3)}^{2} \\ (m + 3 )(m - 3)$

b)

$81 - {x}^{2} {y}^{2} \\ {(9)}^{2} - {(xy)}^{2} \\ (9 + xy)(9 - xy)$