Which of the following could be a function with zeros of -3 and 2?
A. f(x)=(x-3)(x+2)
B.f(x)=(x-3)(x-2)
C.f(x)=(x+3)(x-2)
D.f(x)=(x+3)(x+2)

Respuesta :

C. Set both equal to zero to get that to work. 

14:43

Given zeros are x=-3 and x=2. Now we have to find which of the given function will satisfy the given zeros. To find that we will just plug x=-3 and x=2 to see which choice gives output 0 for both.


Test for A. f(x)=(x-3)(x+2)

f(-3)=(-3-3)(-3+2)=(-6)(-1)=6

Output is not 0 so this can't be the answer.


Test for B.f(x)=(x-3)(x-2)

f(-3)=(-3-3)(-3-2)=(-6)(-5)=30

Output is not 0 so this can't be the answer.


Test for C.f(x)=(x+3)(x-2)

f(-3)=(-3+3)(-3-2)=0(-5)=0

f(2)=(2+3)(2-2)=(5)(0)=0


Output is 0 so this is the answer.


Test for D.f(x)=(x+3)(x+2)

f(-3)=(-3+3)(-3+2)=(0)(-1)=0

f(2)=(2+3)(2+2)=(5)(4)=20

Output is not 0 so this can't be the answer.


Hence final answer is C.f(x)=(x+3)(x-2)