Question

The product (9x – 7xy) (9x – 7xy) is

Answer 1

Answer:

ANSWER

We know that,

(a−b)

2

=a

2

+b

2

−2ab

∴(9x−7xy)

2

=(9x)

2

+(7xy)

2

−2(9x)(7xy)

=81x

2

+49x

2

y

2

+126x

2

y

Hence, option (C) is correct.

Step-by-step explanation:

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