Question

Which statement is true about the difference square root of 7 - square root of 28?

It is rational and equal to -2.

It is rational and equal to 0.

It is irrational and equal to -2square root of 7.

It is irrational and equal tosquare root of 7.

Answer 1

@SolomonZelman

Answer 2

@heyyeahyou

Answer 3

@precious13

Answer 4

It'd be best, I think, to reduce Sqrt(28) by first re-writing it as Sqrt(4)*Sqrt(7).

Please simplify this.

Answer 5

i dont get it @mathmale

Answer 6

Are you sure the last choice does not have a minus sign missing?

Answer 7

yeah im sure @ranga

Answer 8

Is the question: \[\Large \sqrt{7} - \sqrt{28}\]

Answer 9

\[Which statement is true about the difference 2\sqrt{7} -\sqrt{28}\]

Answer 10

that is different from the original posting.

\[2\sqrt{7} - \sqrt{28} = 2\sqrt{7} - \sqrt{4*7} = 2\sqrt{7} - 2\sqrt{7} = 0\]

Answer 11

It is rational and equal to -2.

It is rational and equal to 0.

It is irrational and equal to -2square root of 7.

It is irrational and equal tosquare root of 7.

Answer 12

wich one is it @ranga

Answer 13

The answer is zero. which one says "equal to 0"?

Answer 14

thank you so much @ranga can you help me on one more

Answer 15

I can assist but I am not supposed to be solving it.

Answer 16

yeah i know im doing the work

Answer 17

Simplify:

square root of 3 times square root of 21

square root of 24

square root of 63

3 square root of 7

None of the above

Answer 18

i think this problem is confusing

Answer 19

I will give a general form and you can use that solve this problem:
\[\Large \sqrt{p} * \sqrt{q}= \sqrt{p*q}\]

Answer 20

hi