## anonymous one year ago Stan evaluated a function with a value and got 3 as the result. He wrote the entire process as a sentence. The function A.f(x)=x^2+2x B.f(x)=x^2-3x , When evaluated with A.3 B.-3 gives the value of 3 which function gices the value 3 when plugged in with 3 or -3 ?

1. anonymous

i do not understand what this question is asking let me try to read it again

2. anonymous

first off you have two functions

3. anonymous

yes function a and b

4. anonymous

not "a function" but if you get 3 for the first one, it means $f(x)=x^2+2x=3$

5. anonymous

oooh i see what it is asking

6. anonymous

plug in 3 in to each function and see which one gives 3 as an answer

7. anonymous

ive tried that but i keep getting 15 or -15

8. anonymous

for the first one?

9. anonymous

the question asks "which function gices the value 3 when plugged in with 3 or -3 ?"

10. anonymous

so evidently it is not A since $3^2+2\times 3=15$

11. anonymous

however if you try B you should get it

12. anonymous

for f(x)=x^2+2x i got -15 when plugged in with -3 and for f(x)=x^2-3x i got 0 when plugged in with -3

13. anonymous

yeah true but if you plug in 3 in to the second one, you should get 3 out

14. anonymous

btw the second one does not get 0 if you plug in 3

15. anonymous

hmmm hold on a second

16. anonymous

$f(x)=x^2+2x$ $f(-3)=(-3)^2+2\times (-3)$ try that

17. anonymous

you do not get $$-15$$ because $$(-3)^2=9$$ not $$-9$$ you should get $$9-6=3$$ for A

18. anonymous

that was correct thank you so much can i ask you just one more question

19. anonymous

sure

20. anonymous

A school is planning an event to raise $1,000 for charity. The cost of organizing the event is$200. The tickets are priced at $6 per child and$8 per adult. If x children and y adults attend the event, the equation that represents the total revenue that the organizers must collect from ticket sales to raise the targeted amount of $1,000 after paying for the$200 in expenses is . If the event were only for adults, adults would have to attend for the organizers to raise the targeted amount.

21. anonymous

how many adults would have to attend for the organizers to raise the targeted amount.? sorry

22. anonymous

& how would you set it up as a equation with the given information

23. anonymous

@satellite73

24. anonymous