Question

For which pairs of functions is (f*g)(x)=12x

-f(x) = 3 – 4x and g(x) = 16x – 3
-f(x) = 6x2 and g(x)=2/x
-f(x)sqrtx and g(x)=144
-f(x) = 4x and g(x) = 3x

Answer 1

have you tried to find the products of f and g in the choices?

Answer 2

12x has x raised to the power of 1, and without any constants or
without any greater-that-1-power-of-x terms.

Answer 3

ok

Answer 4

the first option will give you constant at the end when multiplied, and the 1st term containing x².

in the second option you multiply 6•2 (giving you 12), and the x's cancel out leaving you with x raised to what power?

see what I mean....? test them just in your head.

Answer 5

oh so its the second one

Answer 6

yes

Answer 7

ty that was realy easy haha

Answer 8

:)

the last one is close, and you get a coefficient of 12, but your x term has a power of 2 (not 1)

Answer 9

and certainyl not 144•√x ....

Answer 10

yw