Question

Simplify using suitable identity:
a) (497)^2
b) 4.8× 5.2

Answer 1

Step-by-step explanation:

a) (497)^2=(500-3)^2=(500)^2-2(500)(3)+(3)^2

=2500-3000+9=(-491). (used (a-b)^2 identity)

b)4.8×5.2=(5-0.2)×(5+0.2)=(5)^2-(0.2)^2

=25-0.04=-24.96. (used (a^2-b^2) identity)