If $${\sqrt{7-2}\over\sqrt{7+2}}=a\sqrt{7}+b$$, then the value of a is : 

If x is real then the minimum value of (x²-x-1) is :

If a^2x+2=1, where a is a positive real number other than 1, then x 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?

If a = 7, b = 5 and c = 3, then the value of $$a^2+b^2+c^2-ab-bc-ca$$ is 

Two numbers x and y (x>y) such that their sum is equal to three times their difference. Then value of $$3xy\over 2(x^2-y^2$$ will be 

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 a+b=17,and a – b =9, then the value of $$ {(4a^2+4b^2)}$$ is: