Question

Using expansion of (a + b)2 or (a - b) find the
value of the following.
(iii) (7.8)​

Answer 1

Answer:

i have some confusion in ur question but i m still answering ....

to find: value of (7.8)²

we can write it as (8 - 0.2)²

by formulae , we know that...

(a-b)² = a² - 2ab + b²

so,

k

(8-0.2) =8² - 2×8×0.2 + (0.2)²

= 64 - 3.2 + 0.04

= 64.04 - 3.2

= 60.84

I hope it will help you...