Question

5 [lim x ^3/2. = 5 (4)^3/2. = 40. How? I can't get the numbers to add up.

Answer 1

\[\LARGE 5 \times \lim_{x \rightarrow 4} x ^{\frac{ 3 }{ 2 }} = \]

Is this what you have...?

Answer 2

http://www.wolframalpha.com/input/?i=5+%284%29%5E%283%2F2%29

Answer 3

\[\LARGE 5 \times 4^{\frac{ 3 }{ 2 }} = 5 \times (4^{\frac{ 1 }{ 2 }})^3 = \] \[ \LARGE = 5 \times (\sqrt4)^3\]

Answer 4

Ah! I see that now :)

Answer 5

I was doing cubed root 4 to power 2

Answer 6

you can also do it as \[\LARGE 5 \times 4^{\frac{ 3 }{ 2 }} = 5 \times \sqrt{4^3} = 5 \times \sqrt{64}\]

Answer 7

ok, so how does that = 64??

Answer 8

duh
never mind.
my blonbe roots are showing :)

Answer 9

haha no prob :) it's easier if you do it the first way (sqrt of 4 first, then cubed).