Question

HELp PLEASE!! Multiply an simplify if possible...
sqrt(7x) (sqrt(x) -7 sqrt(7))

I got 336x

Answer 1

\[\sqrt{7} (\sqrt{x}-7\sqrt{7})\]

Answer 2

Would it not be
\(\sqrt{7x} (\sqrt{x}-7\sqrt{7})\) ?

Answer 3

yeah

Answer 4

@mathmate

Answer 5

wait, so the problem is: \(\large\color{black}{\sqrt{7x} \times(\sqrt{x} -7\sqrt{7}) }\)

Answer 6

\(\large\color{black}{\sqrt{7x} \times\sqrt{x}=? }\)
\(\large\color{black}{\sqrt{7x} \times7\sqrt{7}=? }\)

Answer 7

yes that's the problem.

Answer 8

\[\sqrt{7x^2}\]?

Answer 9

for the first one you are correct.

Answer 10

so, can you simplify the first one?

Answer 11

would it be 7x

Answer 12

not exactly.

Answer 13

ok then I am not sure

Answer 14

\(\large\color{black}{\sqrt{7x^2}=\sqrt{7}\times\sqrt{x^2} =? }\)

Answer 15

I have to list my steps for this question

Answer 16

oh uhm no idea

Answer 17

we will do this when we overview

Answer 18

\(\large\color{black}{\sqrt{x^2} =x }\)

So, \(\large\color{black}{\sqrt{7}\times\sqrt{x^2} =? }\)

Answer 19

wouldn't it just be \(\large\color{black}{\sqrt{7}~x }\) ?

Answer 20

(or, \(\large\color{black}{x\sqrt{7} }\), same thing )

Answer 21

Ok so its x\[\sqrt{7}\]

Answer 22

yes. \(\large\color{black}{x\sqrt{7} }\)

Answer 23

and \(\large\color{black}{\sqrt{7x}\times7\sqrt{7} =? }\)

Answer 24

no idea

Answer 25

it went away

Answer 26

I deleted it, because it had an error.


\(\large\color{black}{7\sqrt{7}\times\sqrt{7x} }\)

I am braking it into,

\(\large\color{black}{\sqrt{7}\times\sqrt{7} \times \sqrt{x}\times7 }\)

Answer 27

can you tell me, what \(\large\color{black}{\sqrt{7}\times\sqrt{7} \times \sqrt{x}\times7 }\) will be?

Answer 28

Rule: (for any real or non-real number \(\large\color{black}{c }\) ) \(\large\color{red}{\sqrt{c}\times\sqrt{c} =c }\)

Answer 29

so, what will happen to the \(\large\color{blue}{\sqrt{7}\times\sqrt{7} }\) part of the \(\large\color{black}{\sqrt{7}\times\sqrt{7} \times \sqrt{x}\times7 }\) ?

Answer 30

7x?

Answer 31

that's the whole thing, \(\large\color{black}{\sqrt{7}\times\sqrt{7} \times \sqrt{x}\times7 }\) ?

Answer 32

like the answer?

Answer 33

it's not the answer to your (entire) problem.

Answer 34

ok based on the c thing you said above

Answer 35

7x^2?

Answer 36

based on you have:
\(\large\color{black}{\sqrt{7}\times\sqrt{7} \times \sqrt{x}\times7 }\)

\(\large\color{black}{~~~~~~~~7~~~~~~\times \sqrt{x}\times7 }\)

Answer 37

ok....49x

Answer 38

and \(\large\color{black}{7 \times7=49 }\). So, \(\large\color{black}{49\sqrt{x} }\)

Answer 39

you were close

Answer 40

oh?

Answer 41

Yay I almost got something!

Answer 42

you are going well....
I love disconnecting in a middle of a reply, makes me feel excited

Answer 43

Oh no!

Answer 44

We had:
\(\large\color{black}{\sqrt{7x}~(\sqrt{x}~-~7\sqrt{7}) }\)

We said:
~ \(\large\color{black}{\sqrt{7x}~\times~\sqrt{x}=x\sqrt{7} }\)
~ \(\large\color{black}{\sqrt{7x}~\times~7\sqrt{7}=49\sqrt{x} }\)

Answer 45

can you tell me the answer to your prblem?

Answer 46

\[x \sqrt{7} \times 49\sqrt{x}\]

Answer 47

you have a minus, in the parenthesis, so, shouldn't it be, \(\large\color{blue}{x\sqrt{7}- 49\sqrt{x} }\) ?

Answer 48

ohh! I see

Answer 49

Okay, then you want to show your work, right?

Answer 50

yeah

Answer 51

this is what i got

Answer 52

oh poo it wont let me post

Answer 53

if the post button is hiding, click Tab+enter

Answer 54

there we go

Answer 55

you are correct.

Answer 56

OK sweet!!!

Answer 57

I have 2 left. Can you help with those as well?

Answer 58

what I would do though, is in 2nd and 3rd row, explain that you are solving for each of the products, to the combine the result of what you get after explanding.

Answer 59

*expanding

Answer 60

ok :)

Answer 61

will see how it goes for me...