If $${x}^2+{y}^2x+1=0$$ then the value of $$x^{31}+y{35}$$ is

If   $$ {{x+1}\over4x}={5\over 2}$$ then what is the value of   $$ 64x^6+1\over 8x^3  $$

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 = 2 then the value of $$ x^3 + 27x^2 + 243x + 631$$ is:

If $$ \sqrt {x^2+y^2}=25$$, and y=2x, find x. 

If a-b=10 and ab=-21, then what is the value of a³-b³?

$${3x+4y-2z+9=17},{7x+2y+11z+8=23}$$ and $$ {5x+9y+6z-4=18}$$ then what is  the value of $$ {x+y+z-34}$$?

If $$ {x=2-2^{1\over 3}+2 ^{2\over 3}}$$, then the value of $$ {x^{3}-6x^{2}+18x+18}$$.