### Home > A2C > Chapter 13 > Lesson 13.1.4 > Problem 13-76

13-76.

See problem 13-75.

(*x* + *y*)(*x*^{2} − *xy* + *y*^{2})

See part (a).

See part (a).

(2*x* − *y*)(4*x*^{2} + 2*xy* + *y*^{2})

See part (a).

Substitute values into the expression in part (a). Then factor as in part (a).