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,

$9x^2 - 49y^2$

Step-by-step 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.