Adding and Subtracting Polynomials

6. Exponents, Polynomials, and Polynomial Functions / Adding and Subtracting Polynomials / 문제 3

문제 3

Which pair of terms is a pair of like terms?

$6 x$ and $6 x squared$

$4 x squared y$ and $4 x y squared$

$7 x y$ and $negative 2 y x$

$3 x squared$ and $negative 5 x$