tolong no 13 smpai 18

13. (2x-4)(2x-4)
4x²-8x-8x+16
4x²-16x+16 (a)

14. (b). (2a-5)(2a+5)

15. 3(x-⅓)=4(x+¾)
3x-1=4x+3
3x-4x=3+1
-x=4
x= -4 (a)

16.-2x+3<-7
x€bilangan asli

-2x+3<-7
7+3<2x
10<2x
5<x
x<5
(1,2,3,4) (a)

17. A=(2,3,4,5,6,7,8)
B=(4,5,6,7)
A-B=(2,3,8) (c)

18. P=(1,2,3,4)
Q=(3,4,5,6)
R=(4,5,6,7)
P iris Q iris R = (4) (b)