Question

which of the following are square roots of the number below
100
a. -10
b.-(100)^1/2
c.100^1/2
d. 25 help please an thank u ?

Answer 1

b and c are another way of writing square root of 100 or square root of -100. That doesn't mean it's an answer though. I would chose a for the answer.

Answer 2

\[\LARGE \sqrt{x}=\left(x\right)^{\frac{1}{2}}\]

Answer 3

-|x| is not a square root of x^2.

Answer 4

Was that directed at me? -10 x -10 = 100

Answer 5

\[\LARGE -(10)^2\neq 100\]

Answer 6

@cococupcoffee you mentioned option ... and that is not true !

Answer 7

option b

Answer 8

sorry, what? i am confused lol

Answer 9

A common mistake is to think that the square root is the inverse of squaring. This is only true for positive values of x.

Answer 10

No, sqrt(100) =10

Answer 11

you said

cococupcoffee 1 Good Answer
b and c are another way of writing square root of 100 or square root of -100. That doesn't mean it's an answer though. I would chose a for the answer.

and option b says

b.-(100)^1/2

\[\LARGE -(100)^{1/2}=-\sqrt{100}=-10\]

and we know that...

\[\LARGE \sqrt{100}\neq -10\]

Answer 12

really? i was taught something else in school then!

Answer 13

\[\LARGE x^2=4 \Longrightarrow x=\pm\sqrt4\]

but...

\[\LARGE \sqrt9 \neq \pm 3\]

Answer 14

It's confusing, I know.

Answer 15

So, kreshnik, i kinda get what you're saying but, doesn't -3^2 = 9?

Answer 16

@cococupcoffee only when we have X,Y, or what ever you can say plus minus because...

\[\LARGE x=\pm \sqrt4 \]

\[\LARGE x=2 \quad \quad x=-2\]

because..

\[\LARGE x^2=4 \longrightarrow (-2)^2=4\]

Answer 17

only when you have bracket !! like this ! :

\[\LARGE (-3)^2=9 \quad \quad but...\quad \quad -3^2\neq9\]

Answer 18

Oh... i am going to sound dumb... but since it's just -3 you're squaring, do you really need the bracket?

Answer 19

@cococupcoffee It's not shame not to know! It's shame not wanting to know!! (Sokrat)

Yes we need them because any number it is squared in POSITIVE number is equal +

if it is odd then is MINUS ... (I mean when we have a minus number on square )..Here are some examples...

\[\LARGE -1^2=-1 \quad ,\quad (-1)^2=1 \quad \text{Because...}\]

\[\LARGE -1^2=-1\cdot 1=-1^2=-1\]

and
\[\LARGE (-1)^2=-1\cdot(-1)=+1\]

\[\LARGE (-1)^{1999}=-1 \quad ,\quad (-1)^{2000}=1\]

Answer 20

Do you understand it ?

Answer 21

I get the odd and even part lol. I even get the part where you are saying that having a bracket means -n x -n, but wihtout bracket, it's -n x n. i am just surprised that i never learned that in school. thanks for the explanation :)

Answer 22

here is why minus...

\[\LARGE -1^2=-1\cdot +1=-1 \quad \quad \because...\]

\[\LARGE (-)\cdot(-)=+ \quad ,\quad (+)\cdot(+)=+ \quad\]

\[\LARGE (-)(+)=- \quad ,\quad (+)(-)=-\]

Answer 23

lol i knew that :) ill ask my math teacher about the whole brackets thing to understand why they had to make it so complicated lol

Answer 24

... ask your teacher, I can't explain them better, but you'll see that they are very easy ;)...

Answer 25

I have to go.. see you later ;)

Answer 26

and once again, thanks for pointing that out! n what do u think is the answer for this question

Answer 27

alritie bye! :)

Answer 28

\[\LARGE \sqrt x=(x)^{\frac12} \longrightarrow \sqrt{100}=\left(100\right)^{\frac12}\]


C 100% bye !