Question

What must be multiplied to 3x + 7y to get 9x² - 49y²?

help.​

Answer 1

(3x - 7y)

Explanation:

we know that

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

=> (a + b) = (3x + 7y)

=>. (a^2 - b^2) = (9x^2 - 49y^2)

=> so, (a - b).= (3x - 7y)

hope it helps

Answer 2

square the whole equation

Explanation:

so, it will change from (3x + 7y)² to 9x² - 49y²

I hope this helps a little bit.