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