Question

даю 25 балловвввввв​

Answer 1

(3х+(-1))²=(3х)²+2*(3х)*(-1)+(-1)²=

9х²+(-6х)+1.

(3х)²=3х * 3х=(3*3)*(х*х)=9х²

(-1)²=(-1)*(-1)=1.