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Playlist Exponents and Radicals 11 videos
We don't like knocking people down to size, but we do like simplifying radicals. Join us?
To solve radical equations, you square both sides, FOIL it out if necessary, and simplify. Ta da!
Start within the parentheses, and then work your way out. Do that, and this expression is yours.
ACT Math 2.4 Pre-Algebra 461 Views
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Description:
ACT Math: Pre-Algebra Drill 2, Problem 4. Which of the following numbers is largest?
Transcript
- 00:03
A little birdie told us you wanted to shmoop a math problem...
- 00:08
Which number is largest? And here are the potential answers...
- 00:15
OK, this question is just asking whether or not we have mastered The Number Line.
- 00:19
The answer is going to be somewhere in the "7"s area ...around here...so this is where it's gonna live.
- 00:25
To get the answer, we just zip through the choices one by one.
Full Transcript
- 00:29
First we have the absolute value of negative 7, which is just... 7.
- 00:33
7 and 3/8 -- ok, so we need to decimalize and we divide 8 into 3.
- 00:40
So three divided by 8 is 0.375... so 7.375. So it lives here.
- 00:49
7.5 is already decimalized for us. Woot. It lives here.
- 00:53
OK, now we have 7 and 1/12 -- well... just looking at this number, we don't need to
- 00:59
go through the hassle of doing the math.
- 01:01
We know 1/12 is less than 1/8, which we just did, and this one will be even smaller...
- 01:06
...so let's just punt it.
- 01:08
And lastly, we have 4/9 -- well... we know 4/8 is one-half, right?
- 01:13
But here we have 4/9, so we know it'll be LESS than a half...
- 01:17
or smaller than the 7.5 number here.
- 01:20
We don't have to blast out the math here either.
- 01:22
The largest is 7.5... and the answer is C.
- 01:25
As in, "Chewbacca's feeling left out."
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