Recent content by theclock54

Homework Statement If the cost of manufacturing x items is: C(x) = (x^3)+21(x^2)+110x+20 Homework Equations All right, so the first few questions asked for total cost of producing 100 items, and marginal cost. I understood those well. Then it asked for the average cost function...

There's always times in my Calculus 1 class where I am completely lost, and just basically copying down what the professor writes, even though I don't understand any of it. The thing that helps me is doing extra homework, my class has to homework online, and submit it with a paper copy. So what...

Everyone learns differently. I never tried in high school, I passed first semester Algebra 2 with a C, and failed the next semester. But, I got serious and took Trig during college, and Pre/Cal (which I thought would be brutal but wasn't) over the summer. Now I'm in Calculus and learning a lot...

If we were to approach positive infinity, that would mean the x's are all approaching a positive number. But the thing is when I put the x in the square root, I square it right? And if I'm approaching negative infinity, the negative just disappears because it's squared. So we must put a negative...

this is still the limit section, i doubt he knows what l'hospital's rule is. neither do i

All right, notice that you can multiply by the conjugate. So that's what we do. In essence we're multiplying by one. We multiply the top and bottom by: square root ((x^2)+2x-1)-x / (x^2)+2x-1)-x notice it's minus x, that's the conjugate. then when you simplify it you get (2x-1)/(square...

*sorry I forgot to put the negative sign on 5...it should be (-5-4x)/(3-x) = y

Okay so first you switch the x's and y's. Then you'll have: x= (3y+5)/(y-4) Let's multiply by y-4 which leaves... xy-4x = 3y+5 when you want to solve for a variable and there's two of them, you want to get them on the same side and factor it out. so now what you do is subtract...

Yeah I've checked OCW, they just have the videos. Lol, yeah I usually do that also. But you still picture everything they do, even though you're not watching the video lol.

I'm interested in going into the field of Electrical Engineering, but still have around 1 or 2 years. What are some activities/projects I can do to get my feet wet with electrical engineering? Any advice, tips would be greatly appreciated. Just something to get me started, and to keep me...

I'm doing well in my Calculus course, but I drive 15 minutes to get to class and back. I really think I should utilize this time. Can anyone recommend any lectures I can listen to while driving? I'm sure it can also really help get the concepts down. Anything would be helpful. Thank you in...

Ohh, I was trying to add up all the fractions first. I didn't even notice the x's canceled out. Okay, so when I subtract 1/x+h - 1/x I get -h/x+h After the mess, I get my answer to be (h+x-1)/x+h

@gb7nash Okay, so now I have: [x^2+2xh+h^2+1]/(x+h) - (x^2+1)/x Get another com. denom then I have: [x(x^2+2xh+h^2+1) - (x^2+1)] / x(x+h)

Yeah we're on derivatives, I just forgot to put the whole equation over h. @gb7nash That's where I'm stuck, when find a common denominator and subtract both equations, the h doesn't cancel out. So I'm doing something wrong. When I add the x+h and 1/x+h, I get [(x+h)^2 + 1]/(x+h) -...

Homework Statement So I have to find the tangent line when x=5. I use the difference quotient, but I'm stuck at the algebra? I can't seem to figure out what steps I should take. Here's what I have: [(x+h)+1/(x+h)] - (x+1/x) I've tried numerous steps on how to solve this, but can't do...