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Today,
03:04 PM
sinx
replied to a thread
integrate Area of a rt triangle w/ hypotenuse=r, horizontal=x, vertical=sqrt(r2-x2)
in
Calculus
Z=int sqrt (r2-x2)dx, limits for x=0, b =r int sqrt (1-(x/r)2)dx; sub x/r=sin&, dx=rcos&d&, =r2 int cos2& d&; sub cos2&+1=2cos2& =(r2/2) int...
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12 replies | 254 view(s)
Today,
01:42 PM
TheOAP
replied to a thread
did I solve this correctly? I get x = 1, 4 for (x^2 - 5x + 5)^3 = 1
in
Intermediate/Advanced Algebra
Dr Peterson, Lesson learnt! Sorry. Being 82 and blind in 1 eye I (too) often make mistakes. Expanding the equation and bringing 1 across :...
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18 replies | 728 view(s)
Today,
01:41 PM
pka
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
I assume that we are working with real numbers. Can you find a real number x such that x^2<0~? 9u^2-6u+1<0 (3 u -1)^2 <0 What does that mean?
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7 replies | 46 view(s)
Today,
01:34 PM
JeffM
replied to a thread
Triviaility vs. Intuition
in
Advanced Math
This is a question about English usage. What is mathematically trivial is easy to prove: for example 1^2 + 2^2 + 3^2 + 4^2 = \dfrac{4 * 9 * 5}{6}....
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1 replies | 18 view(s)
Today,
01:21 PM
Denis
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
You don't have a pencil?
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7 replies | 46 view(s)
Today,
01:19 PM
Denis
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
AGREE...good advice!!
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7 replies | 46 view(s)
Today,
01:15 PM
JeffM
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
You are correct, but you still are not showing your work. Just telling you whether your answer is right or wrong does not let us see what you are...
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7 replies | 46 view(s)
Today,
12:21 PM
shahar
started a thread
Triviaility vs. Intuition
in
Advanced Math
If I say that something has triviality context, can I say that something is intuition? Is Triviality = intuition?!
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1 replies | 18 view(s)
Today,
11:01 AM
Dr.Peterson
replied to a thread
integrate Area of a rt triangle w/ hypotenuse=r, horizontal=x, vertical=sqrt(r2-x2)
in
Calculus
Keep in mind that this arose when you were wrongly taking r as a constant; so that your integral represents not a triangle, but part of a circle. ...
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12 replies | 254 view(s)
Today,
10:59 AM
spaceshowfeature1
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
The answer I got for the problem you gave me is: 2<x<3 or in interval notation: (2,3)
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7 replies | 46 view(s)
Today,
10:44 AM
spaceshowfeature1
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
Thank you! I will solve and use Symbolab. Have a great day!
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7 replies | 46 view(s)
Today,
10:35 AM
JeffM
replied to a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
You can easily make them up. (ax \pm b)^2 = ax^2 \pm 2abx + b^2. Substitute any integers for a and b, and you have the type of polynomial you...
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7 replies | 46 view(s)
Today,
10:27 AM
sinx
replied to a thread
integrate Area of a rt triangle w/ hypotenuse=r, horizontal=x, vertical=sqrt(r2-x2)
in
Calculus
yes, and in this exercise there arose an integration puzzle. how to integrate Z=int sqrt (r2-x2)dx? , where r is constant, limits for x=0, b ...
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12 replies | 254 view(s)
Today,
10:26 AM
lookagain
replied to a thread
Where's the fallacy in this proof? (that 1 - 1 equals 2)
in
Beginning Algebra
Other than missing an open parenthesis (by typo?), the plus or minus symbol should not be there: \{(-1)^{1/2}\}^ \ = \ (i)^2 \ = \ -1. ...
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3 replies | 134 view(s)
Today,
10:17 AM
spaceshowfeature1
started a thread
Help Finding Perfect Square Inequalities Practice Problems
in
Intermediate/Advanced Algebra
I need help finding specific problems for polynomial Inequalities. Every problem I’ve attempted with perfect squares has ended up wrong. I’ve...
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7 replies | 46 view(s)
Today,
09:43 AM
JeffM
replied to a thread
weird conic section problem
in
Intermediate/Advanced Algebra
My problem with this problem is that we do not know what an algebra student is expected to know. It is not trivial to prove that, if a tangent...
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7 replies | 104 view(s)
Today,
07:29 AM
HallsofIvy
replied to a thread
Radicals and rational exponents: How is "30 = 1" a true statement?
in
Beginning Algebra
We can, by simply counting positive integer exponents, get the very nice formula a^ma^n= a^{m+n} (for example, a^3a^2= (a\cdot a\cdot a)(a\cdot a)=...
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5 replies | 243 view(s)
Today,
07:12 AM
HallsofIvy
replied to a thread
weird conic section problem
in
Intermediate/Advanced Algebra
No, not "random" tangents! There are only two lines through (-3, 0) that are tangent to y^2= x+ 1. Before you can draw them you have to determine...
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7 replies | 104 view(s)
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