Jack1
  • Jack1
could really use a hand please: f(x) = x^3 + x^2 +9x -9 find a point on this graph, that the tangent line drawn at that point passes through the point (4,-1)
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
(4,-1)
dan815
  • dan815
general the equation of the tangent lines to this graph
dan815
  • dan815
and ssee which tangent line passes thru point (4,-1)

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More answers

Jack1
  • Jack1
@dan815 yeah... i know the eqn would be y = mx +c...? how would i fiind my x y coordinate on the graph?
dan815
  • dan815
oh no thats wrong umm wait
dan815
  • dan815
ohh i know u cud do this working backwards
Jack1
  • Jack1
ok... how backwards...?
dan815
  • dan815
|dw:1371024806359:dw|
dan815
  • dan815
it something like this right
dan815
  • dan815
so write an expression for slope of the function between point 4,-1 and a point on graph and see where the slope of the function =s this
Jack1
  • Jack1
ok... actually sorry the eqn was meant to be -9x - 9, but the method will work for either, so ok
dan815
  • dan815
so u get 2 simultaenous equations to solve
Jack1
  • Jack1
write an expression for slope of the function between point 4,-1 and a point on graph and see where the slope of the function =s this... sorry dude u lost me here? which point should i choose...?
anonymous
  • anonymous
|dw:1371024782431:dw|
anonymous
  • anonymous
|dw:1371025169239:dw|
dan815
  • dan815
|dw:1371025077465:dw|
dan815
  • dan815
oh oops miss wrong the first function
dan815
  • dan815
|dw:1371025316351:dw|
dan815
  • dan815
now make those 2 equations = toeach other and solve
dan815
  • dan815
|dw:1371025387596:dw|
dan815
  • dan815
these are the 2 points
anonymous
  • anonymous
DAN I ALREADY DID THE PROBLEM STOP WASTING YOUR TIME :D
dan815
  • dan815
|dw:1371025411346:dw|
dan815
  • dan815
|dw:1371025491935:dw|
dan815
  • dan815
solve this i wanna see what x u get
Jack1
  • Jack1
sgh|dw:1371025622042:dw| dude i cant read this, im really sorry what are my 2 points im doing the sim eqns for?
Jack1
  • Jack1
i know one's derivative, yes?
dan815
  • dan815
and the other is from these 2 pts
anonymous
  • anonymous
@Jack1 I did the whole problem for you if you would just scroll up
dan815
  • dan815
|dw:1371025688904:dw|
dan815
  • dan815
|dw:1371025718954:dw|
dan815
  • dan815
ur answers are -2,2,11/2?
Jack1
  • Jack1
sorry dude, pen and paper, still solving
dan815
  • dan815
i tried solving it on wolfram, check if those are really ur answer, or maybe we doing something wrong xD
dan815
  • dan815
11/2 makes sense i dunno how wolfram gives the other 2
Jack1
  • Jack1
the function undulates, so there are 3 possible points where the tangent would pass through the point 4, -1
anonymous
  • anonymous
you guys are noobs
dan815
  • dan815
ok nvm they are all right
dan815
  • dan815
2,-2 and11/2!!
Jack1
  • Jack1
and you're pi55ed you didnt get the medal @future, so fark off u arrogant d1ck
dan815
  • dan815
i forgot ur function was -9x-9
dan815
  • dan815
lol futue is just joking dont worry about him
Jack1
  • Jack1
k
anonymous
  • anonymous
Reported. GF with your ban
Jack1
  • Jack1
awww. did future tell on me...? Go have a cry coz no-one's worshipping u, ya tool Maybe if you're not so pushy, people may respect u
Jack1
  • Jack1
cheers for the help @dan815 slaters
anonymous
  • anonymous
You're still gonna get banned ,doesn't bother me

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