1. Estimate the square root of the following numbers upto one decimal place
(1) 150
Answers
Step-by-step explanation:
Given : 150
To Find : Estimate the square root of the following numbers upto one decimal place
Solution:
150
144 < 150 < 169
12² < 150 < 13²
Divide 150 by 12 ( we can divide by 13 also shown at end )
150/12 = 12.5
Take average of 12 and 12.5
= 12.25
Divide 150 by 12.25
= 12.24
Hence Square root lies between 12.24 and 12.25
So upto one decimal = 12.2
if we took 13 instead of 12
Divide 150 by 13 = 11.54
Take mean of 13 and 11.54 = 12.27
Divide 150 by 12.27 = 12.22
Hence Square root of 150 lies between 12.22 and 12.27
Hence upto one decimal = 12.2
or use
f(x) = √x
f(150) = √150
f(x + Δx) = √(144 +6)
x = 144 Δx = 6
f'(x) = 1/2√x
f(x + Δx) = f(x) + f'(x) Δx
=> √150 = √144 + (1/2√144)(6)
=> √150 =12 + 0.25
=> √150 = 12.25
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