If f(x)= x^2-2x and g(x)=6x+4, for which value of x does (f+g)(x)=0

all work is shown and pictured

x = - 2

Step-by-step explanation:

The problem might be easier if you wrote what (f + g)(x) means.

f(x) + g(x) = 0 is what the equations means from which you get.

x^2 - 2x + 6x + 4 = 0

x^2 + 4x + 4 = 0    This factors into

(x + 2)^2 = 0

Take the square root of both sides.

sqrt(x+2)^2 = sqrt(0)

x + 2 = 0

x = - 2

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