Question

(7.8)²-(2.2)² simplyfy

Answer 1

Answer:56

Step-by-step explanation:(7.8)²-(2.2)²

= (7.8-2.2)(7.8+2.2).

[Reason: (a)²-(b)²=(a-b)(a+b)

= (5.6)×(10)

= 56

Answer 2

Answer:56

Step-by-step explanation:

(7.8)^2 -(2.2)^2

=(7.8+2.2) ×(7.8-2.2)

[since a^2 - b^2= (a+b)(a-b)]

=10×5.6

=56