Question

(7a-9b)(7a-9b) = ?
using identity

(a-b²)= a²-2b+b²
____________
a = 7a
B = 9b
​

Answer 1

Step-by-step explanation:

(7a-9b)^2

(7a)^2 -2(7a)(9b) +(9b)^2

49a^2 -126ab +81b^2