Melody

Hi Chris, I thought that you sere doing another post.  Did you change your mind?

(4x+2) / (x^2-3x+2)

\(=\frac{(4x+2) }{ (x^2-3x+2)}\\ =\frac{2(2x+1) }{ (x-1)(x-2)}\\ \mbox{You cannot divide by zero so } \\ x-1\ne0\qquad and \qquad x-2\ne 0\\ x\ne1\qquad\qquad and \qquad x\ne 2\\\)

a. The number(S) for which the rational expression is underfined is/are x=1 and x=2

Perhaps you can try to do the other ones yourself :)

find the cumulative area of P(z<4.87)

Very close to 1

I'd expect tht to be correct to at least 5 sig figure

I am basing this on the fact that  P(z<3) = 0.9985    approx

Do you need more accuracy?

On the front (question) page of the forum it is 2x as well!  

I mean where all the questions are.  :/

Thanks Chris :)

sin2x+sinx=0 

that is interesing

When i copied and pasted the question into my post the position of the 2 changed !

I didn't know that happened.  !!

How annoying!

HEre watch this and LEARN !!

https://www.youtube.com/watch?v=O8ezDEk3qCg

Hi Steven434, welcome to the forum :)

This is NOT a calculus question - it is a trig question ://

How would you solve this trig equation?

 2sin2x+sinx=0 

Where 0<x<360

\( 2sin2x+sinx=0 \\ 2(sin^2x-cos^2x)+sinx=0\\ 2(sin^2x-[1-sin^2x])+sinx=0\\ 2(sin^2x-1+sin^2x)+sinx=0\\ 2(2sin^2x-1)+sinx=0\\ 4sin^2x-2+sinx=0\\ 4sin^2x+sinx-2=0\\ let\;y=sinx\\ 4y^2+y-2=0 \)

4y^2+y-2=0 = {    y=-(((sqrt(33)+1)/8)),       y=((sqrt(33)-1)/8)}

-(((sqrt(33)+1)/8)) = -0.8430703308172536

((sqrt(33)-1)/8) = 0.5930703308172536

so

sinx = - 0.8430703308172536    (this will be in 3rd and 4th quadrants)     

              OR         sinx = 0.5930703308172536             (this will be in 1st and 2th quadrants) 

sinx = 0.8430703308172536                 OR             sinx = 0.5930703308172536

x=asin(0.8430703308172536)

asin(0.8430703308172536) = 57.46577 degrees

asin(-0.8430703308172536) = 180+57.46577     or      360-57.46577       degrees

asin(-0.8430703308172536) = 237.46577     or      302.53423       degrees

asin(0.5930703308172536) = 36.375192227   or    180-36.375192227

asin(0.5930703308172536) = 36.375192227   or    143.6248077  degrees

So to 2 decimal places the answers are 

36.38   and    143.62  and     237.47    and      302.53      degrees

Cause you can - good morning to you to adelyn-rae :)

What prompted this post Chris ???    :D

Find all numbers for which the rational expression is underfined.

V+9/v-8

*select the correct choice and fill in any answer boxes within you choice

1. The rational expression is underfined for v=

2. The rational expression is never underfined

----------------------------------------------------------------------------------

Even if there are no brackets , you can put some in to make the meaning clear.

[The no brackets bit should have been included in the body of the question as I almost missed it!]

Anyway, 

what you have asked is

\(v+\frac{9}{v}-8 \)

You cannot divide by zero so v cannot equal 0.

SO, what do you think that the answer is?