- Wed Mar 30, 2016 5:11 pm
- Forum: Calculus
- Topic: Equation of a tangent line, did I do this wrong?
- Replies:
**1** - Views:
**107**

(a) By using the definition of the derivative, find y' if y = 6 - 2x - x 2 . (b) Find the equation of the tangent line to the curve at the point (1, 3). (c) Find the point(s) at which the tangent line is horizontal. Here is... my work: (a) -2 - 2x how did...

- Wed Mar 30, 2016 5:05 pm
- Forum: Beginning Algebra
- Topic: Need help with this problem
- Replies:
**1** - Views:
**132**

The Amazon website plans to purchase ads in a local newspaper advertising their site. Their operating budget will allow them to spend at most $2200 on this advertising adventure. They plan to run at most 20 ads. An ad will cost $50 to appear in the weekday paper and $200 to appear in a weekend edit...

- Mon Jan 04, 2016 12:37 am
- Forum: Calculus
- Topic: One more question: line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8
- Replies:
**4** - Views:
**771**

Wow this is really quick but I have one more question from the book. It's 18 under the AB Diagnostic Test: an equation to the line tangent to y=2 sin(2 x+(3pi/4)) at x=pi/8 is.... the answer is y+ pi/2 = 4x, and I'm struggling with how to get it what did you do after you did the deriv? plz show eve...

- Mon Jan 04, 2016 12:36 am
- Forum: Calculus
- Topic: Help on study question: evaluate lim x->0 (sin^2(4x))/x^2
- Replies:
**1** - Views:
**387**

They kinda explain it, but I don't quite understand how to do the problem how did they do it? where did it not make sense? evaluate lim x->0 (sin^2(4x))/x^2 prob you need to use this lim: \displaystyle \lim_{\theta\, \rightarrow\, 0}\, \dfrac{\sin\left(\theta\right)}{\theta}\, =\, 0 put thi...

- Mon Jan 04, 2016 12:29 am
- Forum: Beginning Algebra
- Topic: Help factoring in the simplest form
- Replies:
**1** - Views:
**713**

..."express in simplest form": ((3((x+1)^(1/2))-5((x+1)^(-1/2)))/(x+1) its kind of hard to read this for sure is it like this? \dfrac{3\, \sqrt{ x\, +\, 1\,}\, -\, \dfrac{5}{\sqrt{ x\, +\, 1\,}}}{x\, +\, 1} i dont know how your book means "simplest" for this prob start w/ common...

- Sat Nov 28, 2015 2:50 pm
- Forum: Trigonometry
- Topic: Trigonometric functions of "theta"
- Replies:
**1** - Views:
**571**

Find the trigonometric functions of "theta". The terminal side of "theta" passes through the given point. (42, -12) My issue is I have the answers which are represented as 7, 2, and, the square root of 53 but I am uncertain as to how one would reach these numbers. ur supposed to...

- Thu Nov 26, 2015 2:39 pm
- Forum: Trigonometry
- Topic: Knowing the unit circle vs. memorizing
- Replies:
**2** - Views:
**523**

Our teacher (rightfully) really wants us to know the unit circle. I learned a cheat to regurgitate it. I can draw the whole thing but I don't "know" it. When I'm doing problems I still look at an actual unit circle and am expected to do better. I'm missing out on some of trig and it takes...

- Sun Oct 25, 2015 9:43 pm
- Forum: Intermediate Algebra
- Topic: Can anyone help me solve this? "The minimum value of a quadratic function is 5 and..."
- Replies:
**1** - Views:
**639**

tzokal wrote:The minimum value of a quadratic function is 5 and this happens when x=2. The point (3,1) is on the graph of the function. Find the equation of the function.

they gave u the vertex (h,k)=(2,5)

they gave u pt (3,1)

plug them into y=a(x-h)^2+k

solve for a

write back if u get stuck

thnx

- Tue Oct 06, 2015 1:25 pm
- Forum: Beginning Algebra
- Topic: Discrete-Time Function
- Replies:
**4** - Views:
**982**

this is not all, but I am just preparing the ground what does this mean? :confused: Consider: f(x(n)) = y(n) = n*x(n) View f as a black box that takes as input some function x(n) and gives as output y(n). And consider that: x(n) is 1 for n = 0,1,2,3 and 0 everywhere else. Then f(x(n)) = y(n) is for...

- Tue Oct 06, 2015 1:20 pm
- Forum: Beginning Algebra
- Topic: Need help with Factoring
- Replies:
**3** - Views:
**682**

diane123 wrote:Oh wow, thank you so much! How do I know to pair 21n^3 with 35n and 18n^2 with -30?

u dont

like i said: if it doesnt work 1 way, try a different way

see what happens