x2- 7x + 1 = 0 হলে এর মান কত?
Created: 4 months ago |
Updated: 4 months ago
best des
Let, x^2-7x+1=0
x^2/x - 7x/x + 1/x =0 [ divided by x ]
x+1/x=7
Now, X^4+1/X^2
= X^4/ X^2 + 1/X^2
=X^2+1/X^2
=(X+1/X)^2- 2.X.1/X [ a^2 +b^2 = (a+b)^2 - 2.a.b ]
=7^2-2=49-2 [ puting the value of x+1/x = 7 ]
=47 (ans)
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