The area of a square is defined by a(x)= x^2 -6x + 9. what is the length of a side of the square? a. x= 1 b. x= 3 c. x= 6 d. x= 9 and explain!

the answer is c

Step-by-step explanation:

i just took a test with this question on it.

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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