Question

IMPORTANT!
Find all the zeros of each function. State the multiplicity of any multiple zeros.

y=(x-1)^2(2x-3)^3 = 1 has a multiplicity of 2 & 2/3 has a multiplicity of 3?

This one I have no idea:
y=(x+2)(x^2+3x-40)

Answer 1

y = (x+2)(x²+3x-40)
(x+2)(x²+3x-40)=0
x+2=0 or x²+3x-40=0
then we have x = -3 +- srqrt169 / 2
x = -3 +- 13 / 2
x' = -16/2 and x'' = 10/2

finally...
x = - 2, x = -8 and x = 5.

is that what you mean?

Answer 2

so i got the first question i asked right? &

Answer 3

How did you get then we have x = -3 +- srqrt169 / 2?

Answer 4

Sorry, I don't know what you mean.

Answer 5

mmm lemme see

Answer 6

its Bhaskara

Answer 7

from x² + 3x - 40

Answer 8

Can you explain to me how you did that step please

Answer 9

remember this? http://3.bp.blogspot.com/_Pjkf6PNC_qk/TAQ8f271AlI/AAAAAAAAAAM/OHlBggN46JY/s320/bhaskara.jpg

Answer 10

quadratic formula

Answer 11

you do that with x² + 3x - 40 (ax² +bx + c)

Answer 12

just replace the letters

Answer 13

\[x^2+3x-40=(x+8)(x-5)\]

Answer 14

you can also factor this:
x^2 +3x -40 = (x+8)(x-5)

Answer 15

No need to us the quadratic formula here.

Answer 16

oh that's right, easier indeed.

Answer 17

Can you explain to me how you factored that

Answer 18

@cubanito
for your answer posted, the 2nd zero should be 3/2 not 2/3

2x-3 = 0
2x = 3
x = 3/2

Answer 19

Yeah, I meant to put 3/2. But those two answers are right?

Answer 20

cubanito, you can factor that like this:
x² + 3x - 40
x 8
x -5

Answer 21

So, its x = - 2, x = -8 and x = 5?

Answer 22

Yep, it is. But make sure you got the whole process, not only the answers.

Answer 23

What about
y= x^3+x^2-19x+5

Answer 24

You want to find the value of x?

Answer 25

no, find all the zeros & state the multiplicity

Answer 26

try zeros -1,-2,-3,-4,-5 and see if they factor out evenly
i suggest using synthetic division

Answer 27

Yea, that's a good way, dumbcow... wait, dumbcow? wth is this name? LOL

Answer 28

i like the irony of it :)

also if you have a graphing calculator, graph the function and see where it crosses x_axis

Answer 29

where does it cross the x axis

Answer 30

when y =0

Answer 31

I'm confused now :(

Answer 32

Melinda....dumbcow?????!!!???

Answer 33

moved here http://openstudy.com/updates/4f43a67fe4b065f388dcafc9