Question

find the product using suitable identity. (3a+7b)(3a-7b)​

Answer 1

Step-by-step explanation:

(3a+7b) (3a-7b)

as we know,that

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

here a=3a,b=7b

(3a)^2-(7b)^2

=9a^2-49b^2

Answer 2

$(3a + 7b)(3a - 7b) \\ = (3a)² - (7b)² \\ = 9a² - 49b²$