Question

find the value of (xyz-5)(xyz-2) by using correct identity​

Answer 1

(xyz-5)(xyz-2)

considering xyz=a,b=-5,c=-2

(a+b)(a+c)=a²+[c+b]a+cb

[(xyz)²+{(-5-2)xyz}+(-5*-10)

x²y²z²-7xyz+50