If x = b+c -2a, y=c+a-2b, z=a+b-2c, then the value of x²+y²-z²+2xy is : 

If a+b = 1 and a³+b³+3ab=k, then the value of k is : 

Find the value of. 67²–33².

If (a+b)=16 and a³+b³=1456, then what is the value of ab?

If (a+b)=16 and a³+b³=1456, then what is the value of ab?

If $$ P={{x^2-36}\over{x^2-49}}$$ and $$ Q={{x+6}\over{x+7}}$$ then the value of $$ {P\over{Q}}$$ is.

If $$ {8x\over{2x^{2}+7x-2}}=1, x>0,$$ then what is the value of of $$ {x^{3}+{1\over x^{3}}}$$ ?

Value of $$ \sqrt{6+\sqrt {6+\sqrt {6+....}}}$$