Question

Which expression is equivalent to (7x+9y)2

Answer 1

`49x^2+126xy+81y^2`

Explanation:

Use the square of a binomial theorem

`(a+b)^2`=
`a^2+2ab+b^2`

Now expand the given equation:

`(7x+9y)^2=49x^2+126xy+81y^2`

Hope this helps :)

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