Question

If x = 3 and y = 2, then the value of ( x - y )(x² + xy + y²) is

(a) 31 (b) 19 (c) 1 (d) 25 ​

Answer 1

`\displaystyle\bf \underbrace{ (x-y)(x^2+xy+y^2)}}_(x^3-y^3)=3^3-2^3=19\\\\Answer: b)19`

Answer 2

19

Explanation:

(3-2)(3^2+3x2+2^2)

(1)(9+6+4)

(1)(19)