math people...i need help

[ManBearPig]

so im doing this online crap, and its asking what the x value of the x intercept is.

-7/3x+2.667

wouldnt it be -7/3?

 

[KLin]

http://www.math.com

 

[Inspector Jihad]

the x intercept would be where y = 0. Set that eq to 0 and solve forit.

 

[Fenixgoon]

clearly math > you

 

[ManBearPig]

thanks guys....heres one that wont work....ive got no idea

Let f(x) = 2x2 + 4.

Find the average rate of change of f(x) between x=-1 and x=3.

wouldnt it be 8? wtf?

 

[Gautama2]

y=mx+b
y=-7/3x+2.667
0=-7/3x+2.667
-2.667=-7/3x
-2.667 divded by -7/3= x

Your welcome.

 

[ManBearPig]

got that im on this now haha

Originally posted by: Heen05thanks guys....heres one that wont work....ive got no idea

Let f(x) = 2x2 + 4.

Find the average rate of change of f(x) between x=-1 and x=3.

wouldnt it be 8? wtf?

 

[dighn]

Originally posted by: Heen05
thanks guys....heres one that wont work....ive got no idea

Let f(x) = 2x2 + 4.

Find the average rate of change of f(x) between x=-1 and x=3.

wouldnt it be 8? wtf?

average rate of change with respect to x would be (change in f(x))/(change in X)

 

[RapidSnail]

The object is to bring the value of y to zero, because it is at that point we find the x-intercept.

The formula we use is y = mx + b (slope-intercept) where m equals slope and b equals the y-intercept

y = mx + b

y = -7/3x + 2.667

0 = -7/3x + 2.667

-7/3x = -2.667

x = 1.143

 

[JujuFish]

Originally posted by: Gautama2
y=mx+b
y=-7/3x+2.667
0=-7/3x+2.667
-2.667=-7/3x
-2.667 divded by -7/3= x

Your welcome.

His welcome what?

 

[SampSon]

Now is the season where all the children come and post their homework on this forum.

 

[DainBramaged]

Originally posted by: JujuFish

Originally posted by: Gautama2
y=mx+b
y=-7/3x+2.667
0=-7/3x+2.667
-2.667=-7/3x
-2.667 divded by -7/3= x

Your welcome.

His welcome what?

It's obvious that math, not English, is his strong point. :laugh: