If (x + 6y) = 8, and xy = 2, where x > O, what is the value of (x³+216y³)?

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

If x = z = 225 and y = 226 then the value of : x³ + y³ + z³ – 3xyz is

if a+b+c=7 and a³+b³+c³-3abc=175, then what is the value of (ab+bc+ca)?

If a = 2·361, b = 3·263 and c = 5·624, then the value of a³ + b³ – c³ + 3abc is

if x+y =3 and $${1\over x}+{1\over y}= -{3\over 10}$$ then the value of (x²+y²) is :

When a number x is divided by a divisor it is seen that the divisor = 4 times the quotient=double the remainder. If the remainder is 80 then the value of x is

 if $$\sqrt { 11- 3\sqrt { 8}}=a+b\sqrt { 2}$$, then what is the value of (2a+3b)?