The function f(x) = (x - 4)(x - 2) is shown.
What is the range of the function?
10+
OF
O all real numbers less than or equal to 3
all real numbers less than or equal to -1
all real numbers greater than or equal to 3
O all real numbers greater than or equal to -1
-10
-8-
-6-
-8810-X

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

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