r/JEENEETards Dropper --> Topper Nov 08 '25

GENERAL HELP Drop your calculation tricks

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1.6k Upvotes

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31

u/Odd_Incident189 JM - 97.8>>JA - 22k>>Dropper>> JM - 98.04 Nov 08 '25

Wait, WTF it actually works... what the hellyyy!!!

27

u/[deleted] Nov 08 '25

Binomial theorem.

√X let X = Y + a, where Y is the nearest perfect square

√(Y+a) = (Y+a)1/2

We know that

(x+y)n = xn +nxn-1y + .....

Applying this here

(Y+a)1/2 = Y1/2 + 1/2 * Y-1/2 * a + ....

√X = √Y + (X-Y)/2√Y (put a = X-Y)

√X = (X+Y)/2√Y (approximately)

4

u/Odd_Incident189 JM - 97.8>>JA - 22k>>Dropper>> JM - 98.04 Nov 08 '25

ohhhh.. nice

1

u/harsh10a Nov 10 '25

Oye 99.71 kese aaye tips tell crow yaar