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 $$ x={\sqrt3\over{2}}$$ then the value of $$ \sqrt{1+x}-\sqrt{1-x}$$ will be

If $$ {4p\over{{p^2}}-4p+4}={1\over8}$$, p≠0 then the value of $$ {p+{4\over p}}$$

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

If a + a²+a³-1=0, then what is the value of a³ +(1/a)?

If $$ {\sqrt{2x+9}+x=13}$$ then find the value of x?

If 0.4 m + 0.8 n = 2.2 and 0.8 m + 0.4 n = 1.4, then the value of $$ {m^2}+{n^2}$$ is equal to 

If x, y are two positive real number and  $$x^{1/3}=y^{1/4}$$, then which of the following relations is true?