Question

If r(x) = 3x − 1 and t(x) = −4x − 1, find (r + t)(7).
Do anyone know the answer to that?

Answer 1

just use the definition
\[ \large (r+t)(7)=r(7)+t(7) \]

Answer 2

so its 49?

Answer 3

ok thanks.

Answer 4

let's see
\[ \large (r+t)(7)=r(7)+t(7)=(3\cdot7-1)+[(-4)\cdot7-1]= \]
\[ \large =(21-1)+(-28-1)=20+(-29)=-9 \]

Answer 5

how about this one
If f(x) = 1 over 3x − 2 and g(x) = −2x − 3, find (f • g)(6)

Answer 6

Would it be -15?

Answer 7

it is pretty much the same
\[ \large (f\cdot g)(6)=f(6)\cdot g(6) \]

Answer 8

\[ \large =\frac{1}{3\cdot6-2}\cdot(-2(6)-3)=\frac{1}{18-2}\cdot(-12-3) \]
\[ \large =\frac{1}{16}\cdot(-15) \]

Answer 9

thanks

Answer 10

u r welcome.
did u get it?

Answer 11

kinda