Quantcast i need algebra help!!!? - XP Math - Forums
XP Math Home Sign Up FREE! | Sign In | Classroom Setup | Common Core Alignment PDF Version

Go Back   XP Math - Forums > Welcome > Off-Topic Discussion

Reply
 
Thread Tools Display Modes
Old 07-28-2007   #1
horrorlover
Guest
 
Posts: n/a
Default i need algebra help!!!?

problem 58 says: find the equation of a line that is perpendicular to y=-1/5x+11 but goes trough the piont (6,8)#61: a) x=? equationfx)=3x-7 f(x)=-1 b) x=? equation: 2x-6 (2x-6 is in the square root sign) f(x)=10(you have to find what x=to56: simplify the rational expression. what valuses can x not be?3xsquare+11x-20 (over) 2xsquare+11x+5
  Reply With Quote
Old 07-28-2007   #2
Dominic D
Guest
 
Posts: n/a
Default

58. to get the slope of the perpendicular line you take the reciprocal of -1/5 and change the sign. so the slope is 5. then use the equation (y-y1) = m(x-x1) where m=5, y1=8, and x1=6. so thats (y-8) = 5(x - 6) + 11 which is the same as y = 5x + 3361. just think of f(x) as y soy=3x-7 and y=-1plug in -1 to the first equation-1=3x-7solve for x6=3xx=256. that factors out to (3x-4)(x+5) / (2x+1)(x+5)the factors (x+5) cancel out so thats (3x-4) / (2x+1)the bottom part, (2x+1), cant equal 0so 2x+1=0 when x = -1/2
  Reply With Quote
Old 07-28-2007   #3
india08_30
Guest
 
Posts: n/a
Default

I'm not too sure what you trying to ask in 61 a & bbut I can help you with #56(3x2+11x-20 ) / (2x2+11x+5)= (3x2+ 15x – 4x -20 ) / (2x2+10x+ 1x +5)= [3x(x+5) – 4(x+5) ] / [ 2x (x+5) + 1 (x+5)]= (3x - 4) /(2x + 1)Setting both sides equal to zero and then simplifying it more= 3x- 4 = 0 and 2x +1 = 0= 3x = 4 and 2x = -1= x 4/3 and x = -1/2 Setting X = to these values will give us a zero in the denominator and the numerator. And hence X cannot be equal to 4/3 and -1/2 Hope this helps
  Reply With Quote
Old 07-28-2007   #4
Sherman81
Guest
 
Posts: n/a
Default

58.)y = (-1/5)x + 11(6,8), m = 58 = 5(6) + b8 = 30 + b-22 + bANS : y = 5x - 22-----------------------------------------61.)a.)f(x) = 3x - 7f(x) = -1-1 = 3x - 76 = 3xx = 2b.)f(x) = sqrt(2x - 6)f(x) = 1010 = sqrt(2x - 6)2x - 6 = 1002x = 106x = 53-----------------------------------------------56.)(3x^2 + 11x - 20)/(2x^2 + 11x + 5)((3x - 4)(x + 5))/((2x + 1)(x + 5))(3x - 4)/(2x + 1)x cannot be -5 or (-1/2)
  Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 12:46 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.
XP Math