If a=25, b=15 , c=-10 then find the value of

if then what is the value of =?

If p³ – q³ = (p-q)[(p-q)²+xpq)] then the value of x is

If and then

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) ?

If , then find the value ?

If then

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