1.

How to calculate factorised (7x-9y)2​

Answer»

FORMULA:-

{(a - b)}^{2}  =  (a + b) \times (a - b)

SOLUTION:-

=( 7 + 9y) \times( 7 - 9y)

= 7(7 - 9y)  \times 7(7  + 9y)

= 49 - 63y \times 49 + 63y

= 49 \times 49

= 2401



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