Question

Tolong bantu jawab no 3 - 5. Tlong jawaban dan caranya scara supaya saya ngerti ngerjainnya..

Answer 1

3) Jwab D
 2x² +10x + 6 =0
a= 2, b = 10 , c = 6
r+s = -b/a = -5
r s = c/a = 3
r² + s² = (r+s)² - 2 rs = (-5)² - 2(3) = 25-6= 19

4) Jwb C
f(x) =  3x² + 2x -1
tik pot dgn sub x -->y= 0
3x² + 2x - 1= 0 --> (3x -1)(x + 1) = 0
x = 1/3 atau x = -1 --> (1/3, 0) dan ( -1,0)
tik pot dgnb sub y --> x = 0 --> y = -1 --> (0, -1)

jwb = (-1,0) ,(1/3, 0) dan (0,-1) 

5) jwb E
2x - 2 < x + 3 < 2 - x
..
2x - 2 < x + 3  atau  x+ 3 < 2 - x
2x - x < 3 +2  atau x + x < 2 - 3
x < 5 atau 2x < - 1
x < 5  atau x < - 1/2
HP x< 5 irisan x < -1/2
hp x < -1/2