Question

13
(i) (7p +9q) (7p - 9q)​

Answer 1

Answer:

(7p)^2 - (9q)^2

=49p^2 - 81q^2

Step-by-step explanation:

So the solution is49p^2 - 81q^2

HOPE IT HELPS...

Answer 2

Solution:-

→ (7p+9q)(7p-9q)

• (a+b)(a-b) = a²-b²

→ (7p)²-(9q)²

☞ 49p²-81q²

$\Large{✓}$

Hope It Helps You ✌️