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Sir, please give us logical reason behind this calculation like why to squire the 9 and other number ? Why to differentiate between 81-80. Also why to double the number when x-1/x or so. Your short cuts methods r interesting, but wondering I’m missing logical reason behind that methods. Anyway, thankyou .
Not understood your explanations and one thing maths will be educated throughthe formula only and how do you explain with better understanding frrom others.
18 ✅
I don’t think you just start doubling answers.
Why 9×2? Dont understand
Answer is wrong sir……
X=9+4^5
x-9= 4^5
And after squaring both side
x(square) +81-18x=80
x(square) +1=18x
Divided both side by x
x+1/x=18
√√√