Question

square of 9x-7xy. Please do fast

Answer 1

heyya

hope my answer will help you in anyway :)

I think your question is ( 9x-7xy ) ²

Hence , here we will use ( a - b ) ² = a² + b² - 2ab #formula

so ,

( 9x-7xy ) ²

⇒ 81x² + 49x²y ² - 2 (9x.7xy)

⇒ 81x² + 49x²y² - 2(63x²y)

⇒81x² + 49x²y² - 126x²y

Hope you are clear ^_^

Answer 2

(9x - 7xy)² = 81x² - 126x²y + 49x²y²

Given :

The expression (9x - 7xy)

To find :

The square of (9x - 7xy)

Formula Used :

(a - b)² = a² - 2ab + b²

Solution :

Step 1 of 2 :

Write down the given expression

Here the given expression is (9x - 7xy)

Step 2 of 2 :

Find the square of (9x - 7xy)

We are aware of the identity that

(a - b)² = a² - 2ab + b²

Using above identity we get

Square of (9x - 7xy)

= (9x - 7xy)²

= (9x)² - 2.9x.7xy + (7xy)²

= 81x² - 126x²y + 49x²y²

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