Question

Calculate
(1) ²- (21)²​

Answer 1

Answer:

Step-by-step explanation:

(1)²-(21)²

LET A = 1

      B = 21

USING THE IDENTITY : A²-B²= (A+B)(A-B)

= (1+21)(1-21)

= 22*-20

= -440.

HOPE THIS HELPS.