If a²+b²+c² = 2(a – b – c) – 3 then the value of 4a – 3b + 5c is 

If x²+y²-4x-4y+8=0, then the value of x-y is: 

Find the value of. 67²–33².

Find the value of n when $$ {n=\sqrt{n+ 2 \sqrt{n+2\sqrt{n+2\sqrt{3n}}}}}$$

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

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

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