Question

$( y - 9z) {?}^{2}$
explain explain using suitable identities
in last the ?2 is it power ​

Answer 1

Answer:

(y -9z)² • [ we know the identity (a -b)² = a² -2(a)(b) +b² ]

=> y² -2(y)(9z) +(9z)²

=> y² -18yz +81z²

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