View Profile: Chris L T521 - Math Help Boards

Today, 11:04

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

When I was a student, I found one of the best ways to understand things is to look at them in general terms. For example, in this problem, rather...

21 replies | 164 view(s)

Today, 10:49

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

What we see is that we must have: L=W And so, what we have found is that for a rectangle of a given area, the perimeter is the smallest it can...

21 replies | 164 view(s)

Today, 10:34

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

Your next step should be: (L-W)^2=0 So, how must L and W be related in order for this to be true?

21 replies | 164 view(s)

Today, 10:28

MarkFL replied to a thread Two Pieces of Wire in Pre-Calculus

No, what we want is: A\left(W_1\right)+A\left(W_2\right)>5 A(x)+A(12-x)>5 Now, the arguments for the area function represent wire lengths,...

10 replies | 67 view(s)

Today, 10:10

MarkFL replied to a thread Two Pieces of Wire in Pre-Calculus

Yes, now we need to answer the question: For which values of x will the combined areas of the squares exceed 5 cm^2? We have two pieces of wire...

10 replies | 67 view(s)

Today, 10:00

MarkFL replied to a thread Two Pieces of Wire in Pre-Calculus

Okay, you have a piece of wire whose length is let's say W...you bend it into a square...what is the perimeter of the square? Then using your formula...

10 replies | 67 view(s)

Today, 09:55

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

Yes, once you simplify, you will find the implication. :D

21 replies | 164 view(s)

Today, 09:53

MarkFL replied to a thread Quadratic Inequality...4 in Pre-Calculus

Yes, now combine terms on the LHS...:D

4 replies | 33 view(s)

Today, 09:44

MarkFL replied to a thread Two Pieces of Wire in Pre-Calculus

Let's use x for the length of the sides of the square, so we have: P=4x A=x^2 Now, we want to replace x in the formula for the area with an...

10 replies | 67 view(s)

Today, 09:39

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

You're just seeing what the equation implies about the relationship between L and W. :D

21 replies | 164 view(s)

Yesterday, 22:50

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

We have: \sqrt{LW}\le\frac{L+W}{2} When I ask "when does equality occur," I am essentially asking you to solve: \sqrt{LW}=\frac{L+W}{2} ...

21 replies | 164 view(s)

Yesterday, 21:56

MarkFL replied to a thread 206.07.05.88 partial fractions??? in Calculus

I would look at a substitution like: u=\sqrt{x^2+4x+3}\implies dx=\frac{u}{x+2}\,du And the integral then becomes: I=\int\frac{1}{u^2+1}\,du

1 replies | 24 view(s)

Yesterday, 19:33

MarkFL replied to a thread Two Pieces of Wire in Pre-Calculus

What is the area $A$ of a square whose perimeter is $P$?

10 replies | 67 view(s)

Yesterday, 19:25

MarkFL replied to a thread Quadratic Inequality...4 in Pre-Calculus

You don't want to multiply an inequality by an expression whose sign is unknown...arrange everything to one side and then get your critical values...

4 replies | 33 view(s)

Yesterday, 19:21

MarkFL replied to a thread Quadratic Inequality...3 in Pre-Calculus

You are assuming x is positive when you do that. A better step is to subtract x/2 from both sides: \frac{2}{x}-\frac{x}{2}<0 Combine terms: ...

2 replies | 30 view(s)

Yesterday, 15:00

MarkFL replied to a thread Quadratic Inequality in Pre-Calculus

Yes, we have a parabola opening upwards, and given that it has two real roots, we should expect to find it to be negative in between its roots. :D

7 replies | 68 view(s)

Yesterday, 14:44

MarkFL replied to a thread I have mathematics problems for solving but i can not understand how to solve these mathematics? in Pre-Calculus

Okay, I have several issues here: 1.) We ask that you post no more than 2 questions per thread: 2.) You've shown no effort:

1 replies | 62 view(s)

Yesterday, 13:38

MarkFL replied to a thread Quadratic Inequality...2 in Pre-Calculus

In this problem, you have a function representing a parabola that opens upwards. We should then expect, given that it has two real roots, that the...

7 replies | 72 view(s)

Yesterday, 11:54

Euge replied to a thread Quadratic Inequality...2 in Pre-Calculus

Yes, that's correct.

7 replies | 72 view(s)

June 22nd, 2017, 14:34

MarkFL replied to a thread Adding Vectors (Final review) in Geometry

If we know the magnitude $M$ of a vector $\vec{v}$, and the direction $\theta$ in which it points, then we may express the vector in component form...

5 replies | 113 view(s)

June 22nd, 2017, 13:51

Ackbach replied to a thread Vectors in Geometry

Right. You need to set $T = 12500$. You have to find the magnitude of the vector part.

9 replies | 94 view(s)

June 22nd, 2017, 13:47

MarkFL replied to a thread Find Perimeter of Rectangle in Pre-Calculus

Let's examine a general rectangle...using the AM - GM inequality we may state: \sqrt{LW}\le\frac{L+W}{2} When does equality occur? Given...

21 replies | 164 view(s)

June 22nd, 2017, 13:32

Ackbach replied to a thread Vectors in Geometry

I would write it more like this (to emphasize its vector nature): $\mathbf{T}_1=\langle T \cos(9^{\circ}), T \sin(9^{\circ}) \rangle$, or...

9 replies | 94 view(s)

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We are an online community that gives free mathematics help any time of the day about any problem, no matter what the level. You will have to register before you can post. To start viewing messages, select the forum that you want to visit from the selection below.

Chris L T521 MHB Journeyman

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