Question

2. Simplify :
(1) (2a + b)' - (2a - b) .
(3) (40 - 3)' - (40 + 3)'.​

Answer 1

Answer:

(2a + b)3 + (2a - b)3 = (8a3 + 12a2b + 3ab2 + b3 ) + (8a3 - 12a2b + 3ab2 - b3)

= 16a3 + 6ab2

Answer 2

by using identity (a+b)(a-b)=a²-b²

(1) (2a)²-b²

4a²-b²

(2) (40)²-(3)²

1600-9

1591