Question

Find p,q, and r if f(0)=-5, f(3)=-5, and f(5)=-35 for f(x)=px^2+qx+r, show the process please

Answer 1

for f(0)
-5 = p (0^2) + q(0) + r
-5 = r
Do you understand this?

Answer 2

yes, go on

Answer 3

use the same concept for the others.

Answer 4

that doesn't give you a complete answer for the others

Answer 5

I'm not gonna help you if you are just looking for answers. Put in some effort.

Answer 6

By using the same concept, I will get -5=9p+3q+r, and -35=25p+5q+r

Answer 7

Which isn't complete

Answer 8

There are more steps afterward, I am just unsure of them

Answer 9

as earlier, remember i found a value for r?

Answer 10

Yeah, by plugging in zero, but that doesnt work for the other functions

Answer 11

nos substitute that r value in the other two equations.

Answer 12

okay so then I'd have -5=9p+3q-5 and -35=25p+5q-5.
And then I use either substitution or elimination to solve the equations right?

Answer 13

yes,

Answer 14

okay one sec lemme work it out and see if i get the right answer

Answer 15

thanks

Answer 16

Okay so the answer is -5=r, -3=p, and 9=q right??? @mickey4691

Answer 17

verify the signs for q and p.

Answer 18

nuuuuuu I got it wrong???? :(

Answer 19

darn.

Answer 20

the signs.

Answer 21

-5=9p+3q-5
that means 9p+3q= 0
then q= -3p

Answer 22

-35=25p+5q-5
then 25p + 5 q = 30
then 5p + q = 6
then 5p - 3p = 6
2p=6
p = 3

Answer 23

once p = 3

Answer 24

q = -3p

Answer 25

q= -3 (3) = -9

Answer 26

wait but 25p+5q= -30 not +30

Answer 27

good job. then you are correct lol.

Answer 28

You deserve the medal lol

Answer 29

i was only testing you lol. i'm kidding.

Answer 30

oh okay thank you so much I wouldn't have gotten there without you :)