Question

How can I factorize the top part?
http://newton.matem.unam.mx:8080/ejercicios/racionales/p0416.gif

Answer 1

what is 3*28?

Answer 2

84

Answer 3

So two numbers that multiplied are 84 and added -25?

Answer 4

\[(s-\frac{a}{3})(s-\frac b3)\]
yes, ab = 28, and a+b = -25

Answer 5

IF it factors into rational parts that will work

Answer 6

err... ab = 84

Answer 7

28 and 3?

Answer 8

since its asking you to simplify; assume that the bottom has a factor common with the top

Answer 9

Yep, I assumed that before

Answer 10

the bottom is what:

(3s-4) (3s+4)

Answer 11

Yep

Answer 12

when s=+-4/3 does the top zero out?

Answer 13

looks like 3s-4 is a factor

Answer 14

so s-7?

Answer 15

(-4)*(-21) = 84
-4-21=-25

Answer 16

\[(s-\frac{4}{3})(s-\frac {21}3)\]
\[(s-\frac{4}{3})(s-7)\]
\[(3s-4)(s-7)\]is the top

Answer 17

Ok, thanks Amistre :)

Answer 18

why no mod status?

Answer 19

and, youre welcome ;)

Answer 20

They removed it from me long time ago :(

Answer 21

When they changed to the system of highest points became mod

Answer 22

hmmm, i recall you being a regular mod instead of just a room mod. If you want it back, all I gotta do is prolly tell Preetha to reinstate you.

Answer 23

I am not really active right now. If I get to be active in some weeks, I will ask you :) thanks