Question

(7p +9q) (7p-9q) can you help me with the formula

Answer 1

Let see your answer !!!!

$(7p + 9q)(7p - 9q) \\ \\ we \: apply \: this \: identity \: here \\ \\ (a + b)(a - b) = a ^{2} - b ^{2} \\ \\ = (7p) ^{2} - (9q) ^{2} \\ \\ = 49p ^{2} - 81q ^{2}$



Thanks :))))

Answer 2

hey mate!!!!!
here is your answer

7p(7p-9q)+9q(7p-9q)
=49p^2-63pq+63qp-81q^2
=49p^-81q^2
is your answer
hope u liked it