## reneebbyx3 2 years ago Consider the functions f(x) = x2 − 13 and g(x) = x + 5. What is the value of (f + g)(3)?

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1. reneebbyx3

the answers are −4 4 −32 8

2. timo86m

f(x) = x2 − 13 do you mean f(x) = x^2 − 13

3. reneebbyx3

yes .

4. timo86m

if so then (x^2 − 13) + ( x + 5) x^2+x-8 add like terms 3^2+3-8 plug in 3 where there are xs =4

5. reneebbyx3

can you help me with this one : Consider the functions f(x) = 13x2 and g(x) = 7x − 5. What is the value of (f − g)(3)?

6. reneebbyx3

@timo86m

7. timo86m

subtract the 2 functions and plug in 3 13*x^2-7*x+5 101

8. reneebbyx3

I know this is alot but could you help me with this one to ? Consider the functions f(x) = 8x + 2 and g(x) = 5x − 3. What is the value of ( )(4)? Please show all of your work for full credit.

9. timo86m

of ( )(4) ^ ?

10. reneebbyx3

f[g(−4)]?

11. timo86m

f[g(−4)] if this is right and you sure it is that then ooh you plug in the whole 5x- 3 into 8x+2 in the x so 8*(5x- 3)+2 40*x-22 distribute the 8 into 5x and - 3 then add the +2 Plug in - 4 -182

12. reneebbyx3

woops, its f/g @timo86m

13. timo86m

f(x) = 8x + 2 and g(x) = 5x − 3 (-4) (8x+2) / (5x-3) just divide then (8(-4)+2)/(5(-4)-3) plug in the -4 where the xs are at 30/23