Mathematics
OpenStudy (osanseviero):

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

OpenStudy (amistre64):

what is 3*28?

OpenStudy (osanseviero):

84

OpenStudy (osanseviero):

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

OpenStudy (amistre64):

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

OpenStudy (amistre64):

IF it factors into rational parts that will work

OpenStudy (amistre64):

err... ab = 84

OpenStudy (osanseviero):

28 and 3?

OpenStudy (amistre64):

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

OpenStudy (osanseviero):

Yep, I assumed that before

OpenStudy (amistre64):

the bottom is what: (3s-4) (3s+4)

OpenStudy (osanseviero):

Yep

OpenStudy (amistre64):

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

OpenStudy (amistre64):

looks like 3s-4 is a factor

OpenStudy (osanseviero):

so s-7?

OpenStudy (amistre64):

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

OpenStudy (amistre64):

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

OpenStudy (osanseviero):

Ok, thanks Amistre :)

OpenStudy (amistre64):

why no mod status?

OpenStudy (amistre64):

and, youre welcome ;)

OpenStudy (osanseviero):

They removed it from me long time ago :(

OpenStudy (osanseviero):

When they changed to the system of highest points became mod

OpenStudy (amistre64):

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.

OpenStudy (osanseviero):

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