Algebra Help: Square Roots
Taking the square root of a perfect square.
Duration : 0:5:58
[youtube DFdm9-7HU4Y]
Tags: algebra, help, math, mathtv, mckeague, root, square
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August 17th, 2009 at 10:09 pm
thanks ! you really …
thanks ! you really help
August 17th, 2009 at 10:09 pm
Thank you- very …
Thank you- very good explaination- my algebra teacher just looked at me
August 17th, 2009 at 10:09 pm
And as usual, the …
And as usual, the reply doesn’t appear under the comment I wanted it to.
August 17th, 2009 at 10:09 pm
Here’s an example …
Here’s an example of this working in real life:
Say you were in an airplane and you were going downwards at a rate of 5m/s. This is the same as going UP at -5m/s.
To figure out the altitude of the plane 30 seconds ago, you would need to multiply by -30 seconds. (Displacement = Velocity x Time)
(-30 sec) x (-5 m/s) = 150 m
i.e. You were 150 metres higher, 30 seconds ago.
August 17th, 2009 at 10:09 pm
thank you alot
thank you alot
August 17th, 2009 at 10:09 pm
why dont you just …
why dont you just put the magnitude of x? its much more simple then trying to put these restrictions on kids because chances are if they dont understand this basic concept then math isnt really going to be what they are going to use in there career choice
August 17th, 2009 at 10:09 pm
A square root of a …
A square root of a square is, essentially, its modulus, or absolute value. So, the root of x^2 is not x, but abs(x).
August 17th, 2009 at 10:09 pm
Could you explain …
Could you explain that in a different way?
August 17th, 2009 at 10:09 pm
can you teach me …
can you teach me how to solve the area of a rectangle when it has square roots?? please?
August 17th, 2009 at 10:09 pm
Why do two …
Why do two negatives multiplied = a positive?
August 17th, 2009 at 10:09 pm
@~@ wah to much …
@~@ wah to much complicated math
August 17th, 2009 at 10:09 pm
There’s good AP …
There’s good AP Calculus help online on the mathnetap website
August 17th, 2009 at 10:09 pm
when he says, the …
when he says, the square root of -X…. there is no legit square root
(-a)(-a) = a ^2
negative times negative = positive
(a) (-a)= - a ^2
but (a) and (-a) are different #s… making it not a square root
August 17th, 2009 at 10:09 pm
great teacher
great teacher
August 17th, 2009 at 10:09 pm
this guy owns.. Im …
this guy owns.. Im working through the whole mathtv site! thank you so much
i cant believe this quality is free, helps sooo much.
August 17th, 2009 at 10:09 pm
You are one of the …
You are one of the great teacher i had ever.
Mudasir
August 17th, 2009 at 10:09 pm
nice
nice
August 17th, 2009 at 10:09 pm
thank you
i …
thank you
i finding about Math Video
you are great!!
August 17th, 2009 at 10:09 pm
Absolutely …
Absolutely fantastic, thank you so much for your videos, they have helped hugely with my exam study. Keep up the great work MathTV
August 17th, 2009 at 10:09 pm
what about plus or …
what about plus or minus X?
August 17th, 2009 at 10:09 pm
thanks
thanks
August 17th, 2009 at 10:09 pm
Thank you for this …
Thank you for this video!!!!
August 17th, 2009 at 10:09 pm
he has some videos …
he has some videos on calculus but not really linear algebra
August 17th, 2009 at 10:09 pm
I love the basics. …
I love the basics. Great stuff!
August 17th, 2009 at 10:09 pm
Thank you very much …
Thank you very much. Your explanation is clear and concise.