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ACT Aspire Math: It's Hip to Be the Square Root of 225 3 Views


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Description:

What is the square root of 225?


Transcript

00:03

Okay Aspiring math people Another drill for you Here we

00:06

go What is the square root of two hundred twenty

00:09

five Find spirit of a number We factor out as

00:15

many perfect squares as possible while twenty five goes into

00:19

two hundred twenty five nine times And well guess what

00:22

Twenty five and nine both happen to be perfect squares

00:25

We factor out a five and a three from each

00:28

of them and so then we've got desperate of twenty

00:31

five times nine and that's the same as the square

00:34

root of five squared times Three square there All right

00:37

then Just distribute the radical sign over The products will

00:40

get square root of five squared times Grow to three

00:42

squared which is samos five times three which is the

00:45

same as fifteen Forgot what perfection or at least a

00:48

perfect square looks like Well check out the answer Choices

00:50

whatever number we need has to end with a five

00:54

So that leaves us with fifteen b or twenty five

00:57

as indeed And from there well it's a quick bit

00:59

of multiplication to eliminate that twenty five and get to

01:02

the right answer because they're not going to ask you

01:03

to take complex square roots on your own without a 00:01:06.313 --> [endTime] calculator In these kind of exams that's just torture

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