Evaluate:
(xy + 4) (xy - 4)
6 Likes
Using the formula
[∵ (x + y)(x - y) = x2 - y2]
= (xy)2 - 42
= x2y2 - 16
Hence, (xy + 4) (xy - 4) = x2y2 - 16
Answered By
4 Likes
Use direct method to evaluate the following product:
(8 - b) (3 + b)
(2a + 3) (2a - 3)
(ab + x2) (ab - x2)
(3x2 + 5y2) (3x2 - 5y2)