If x + y = 1 and xy (xy – 2) = 12,then the value of x⁴ + y⁴ is:

If (27x³ – 343y³) ÷ (3x – 7y) = Ax² +By² + 7Cyx, then the value of (4A – B +5C) is:

If a + b + c=15, abc=120 and (ab+bc+ca)=74, then the value of a³+b³+c³=?

 If x+y=14: x³+y³=1064, then the value of (x-y)² is:

If x⁴+2x³+ax²+bx+9 is a perfect square where a and b are positive real numbers, then the value of a and b 

If $$ {x+{1\over {x}}=1}$$, then find the value of $$ {x^{208}+{x^{205}+x^{204}+x^{201}}}$$.

If x + y + z=1, xy+yz+zx=-26 and x³ + y³+z³=151, then what will be the value of xyz?