Question

Jawab nomor 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 guys :) , Kasih caranya juga yak :)

Answer 1

14. -2 < 2x/3 < 4; kali 3/2
-3 < x < 6.....opsi A

15. 3x-1 >= 2x+4
x >= 5....opsi C

16. x^2+4x-5 = 0
(x+5)(x-1) = 0
x=-5 atau x= 1....opsi E

17. x^2-6x+5 = 0
(x-1)(x-5) =0
x= 1 atau x= 5....opsi E

18. 2x^2-8x = 0
2x(x-4) = 0
x= 0 atau x= 4....opsi A

19. x^2+(p-4).x -5p = 0, masukkan nilai x=4
4^2+(p-4).4 -5p = 0
16+4p-16-5p = 0
-p = 0.....opsi C

20. x^2+(a-2)x-(4a-1) = 0, x=3
3^2+(a-2)3-4a+1 = 0
9+3a-6-4a+1 = 0
-a + 4 = 0
a= 4

x1.x2 = -4a+1
3.x2 = -15
x2 = -5.....opsi A

21. (x-1)(x-2) = 0
x^2 - 3x + 2 = 0....opsi D

22. 21+4x-x^2 > 0
(7-x)(3+x) > 0
-3 < x < 7.....opsi E

23. 2x^2 + 5x - 3 >= 0
(2x-1)(x+3) >= 0
x =< -3 atau x >= 1/2...opsi A

24. x^2+ax+a = 0
agar memiliki akar real, maka D >= 0
D >= 0
b^2 - 4.a.c >= 0
a^2 - 4.1.a >= 0
a^2 - 4a >= 0
a(a-4) >= 0
a =< 0 atau a >= 4...opsi D

lunas ya....