Select the correct answer. Which equation could be solved using this application of the quadratic formula?
-2 V22 – 4(1)(-4)
2(1)
=
O A.
x2 + 1 = 2x-3
OB.
x² – 2x-1=3
OC.
x² + 2x-1=3
OD D. x2 + 2x - 1 = -3

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