(3a-b)(5b+a) при a=2;b=-3

Question

(3a-b)(5b+a) при a=2;b=-3

Answer 1

(3а-b)(5b+a)=(3*2-(-3))(5*(-3)+2)=(6+3)(-15+2)=9*(-13)=-117.

Answer 2

(3a-b)(5b+a) = 3x2-(-3)x5x(-3)+2= 6-(-3)x(-15)+2=9x(-13)=-117.