Question

i chose c am i correct?

1. Which function is an odd function?
(Points : 1)
f(x) = 0.8x^3

f(x) = 5x^2

f(x) = 0.7x^2 + 3

f(x) = 3x - 1

Answer 1

@hartnn what do you think?

Answer 2

for an odd function
f(-x) = -f(x)

Answer 3

so, just replace 'x' by -x in your functions, what do u get ?

Answer 4

f(x) = 0.8(-x)^3

f(-x) = (5-x)^2

f(-x) = 0.7(-x)^2 + 3

f(=x) = 3(-x) - 1

Answer 5

so whats (-x)^3= ... ?

Answer 6

-x *-x * -x = (+)x^3

Answer 7

2 negatives become positive
but 3 negatives is negative only

Answer 8

but the exponent wouldn't it be -x multiplied by itself 3 times?

Answer 9

yes

Answer 10

-x *-x * -x = (-)x^3

Answer 11

but its separated like this?:

(-x * -x) *-x

Answer 12

x^2*-x = -x^3

Answer 13

ok so , then my answer is b or c

Answer 14

no, you need the -
for a, f(-x)=-f(x)
so its odd

Answer 15

its odd if (-x) is not equal to f(x) or -f(x) right?

Answer 16

i have them mixed up

Answer 17

its odd if it is =-f(x)

Answer 18

so a = 0.8 * (-x) ^3 = -0.8 depending on what x is?

Answer 19

what!?

Answer 20

for it to be odd it has to = -f(x)

Answer 21

f(x) = 0.8x^3
is odd, because f(-x) = -f(x)

Answer 22

oh, so i really just had to focus on f(x) like the choices of a and b because i was only given f(-x) not in slope intercept form