X + x minus 1 power = 3, find the value of the third power of X + x minus 3 power emergency It should be 18

X + x minus 1 power = 3, find the value of the third power of X + x minus 3 power emergency It should be 18

This problem can be solved by using the cubic sum formula A & sup3; + B & sup3; = (a + b) (A & sup2; - AB + B & sup2;) = (a + b) [(a + b) & sup2; - 3AB]
x³+x^-3
=(x+x^-1)(x^2-1+x^-2)
=(x+x^-1)[(x+x^-1)²-3]
=3×[3²-3]
=3×6
=18