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

If $$x+{1\over x}=c{1\over c}$$ then the value of x

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

A complete factorization of x⁴+64 is 

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 15x² – 26x + 8 = (Ax + B) (Cx + D), where A and C are positive integers, then what is the value of (2A + B – C – 2D) ?