-
I'm helping my girlfriend with her homework, which is square root problems. I have a question on the format in which you write the answers.
For example this problem:
Are the 5 and 4 in the right places or do they need to be switched? Also is the x^2 supposed to be written like that? She said yes but I don't remember.
Also if the variable is higher than 2 is it still written that way? She says this is correct but I'm really not sure:
I just havent done this stuff in pretty much forever. Thanks to anyone who can help.
-
Ok If I remember correctly what you have written there means 5 multiplied by the square root of 4. The one with the X doesn't make sense because I think its the square root of X squared, which would be X. Now here's where I'm really guessing, I think if the variable is higher then 2, its written in that little "V" portion of the sign. Hope this helps and I'm remembering correctly. Try googling it!
-
i think the first would be sqrt (10x * 8x )
= sqrt(80x^2)
= sqrt(4*4*5*x*x)
= 4x sqrt(5)
-
second i think is
sqrt ( 24x^4/3x)
= sqrt (8x^3)
= sqrt(4*2*x^3)
= 2 sqrt(2x^3)
-
Another way to think of it is that the square root function is the same as raising the value to the power of 1/2.
So,
sqrt(10x) = (10x)^(1/2)
Then you can do the multiplication simpler IMO.