Question

if x²+1/x²=18 find the value of 3x³+6x-3/x³-6/x​

Answer 1

x^2 + 1/x^2 = 27 (x - 1/x)^2 = x^2 + 1/x^2 - 2×x×1/x ie. (x - 1/x)^2 = 27 - 2 = 25 ...X1 X2 45-5 (5"7₹)78₹6489