Question

Tolong dibantu no 14 dan 15, cma tau salah satu gk papa yg penting pakai cara

Answer 1

14) A=[1 a] ,B=[3 b] dan C=[1 4]
[2 -1] [-1 1] [7 c]
jika AB=C, maka a+b+c?
[1 a] [3 b] [1 4]
[2 -1].[-1 1]=[7 c]
[3-a b+a] [1 4]
[6+1 2b-1]= [7 c]
[3-a b+a] [1 4]
[7 2b-1]=[7 c]

•3-a=1
-a=1-3
-a=-2
a=2

•b+a=4
b+(2)=4
b=4-2
b=2

•2b-1=c
2(2)-1=c
4-1=c
3=c

a+b+c?
2+2+3=7