Question

Find the product of (3x + 7y)(3x − 7y).

9x2 − 42xy + 49y2

9x2 + 42xy + 49y2

9x2 − 49y2

9x2 + 49y2 ...?

Answer 1

9x2-49y^2 is the answer

Answer 2

Answer: The product is,

`9x^2 - 49y^2`

Explanation:

Here, the given expression is,

`(3x + 7y)(3x - 7y)`

We know that,

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

`=(3x)^2 - (7y)^2`

`=9x^2-49y^2`

Hence, the product of (3x + 7y)(3x - 7y) is
`9x^2-49y^2`

Third option is correct.