Question

Tolong dibantu no 9,10,11 ya. soalnya besok dikumpulin. makasih :)

Answer 1

9. a
10. c
11. b
kalo tidak salah

Answer 2

X² =  x + 2
x² - x - 2 = 0
(x-2) (x+1) = 0
x=  2 ⇒ y = x² = 2² = 4  (2,4)  D.
x= -1 ⇒ y = -1² = 1  (-1,1)

x² + (2m + 1)x + 2 = x + m
x² + (2m + 1)x -x + 2 - m = 0
x² + 2mx - m + 2 = 0
x² + 2mx + (2-m) = 0
menungging = D=0
4m² - 4.1.(2-m) = 0
4m² - 8 + 4m = 0
(4m - 4)(m-1) = 0
4m - 4 = 0        m -  1= 0
m = 1                m = 1
x² + 2x + 1= 0
( x+1)² = 0
x= -1
y = m + x
   = 1 + (-1)
   = 0
x,y = -1,0

x² + y² = 5
x + y  = 1
   (x+y)² = 1
   5 + 2xy = 1
         2xy = -4
           xy = -2
            y = -2/x
x  +  y = 1
x + -2/x = 1
x² -2 = x
x² - x - 2 = 0
(x - 2)(x + 1) = 0
x=2      x=-1  D.