Answer :
Let y =√x.
Let x =25 and Δx = 2.
As y = √x.
⇒
We, know
⇒
∴
⇒
⇒
∴ Δy = 0.2
Also,
Δy = f(x+Δx)-f(x)
∴
⇒ 0.2 = √27 – 5
⇒ √27 = 5.2
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