Question

Which statement is true about the difference 2 radical 7 - radical of 28?

It is rational and equal to -2.

It is rational and equal to 0.

It is irrational and equal to -2 radical 7.

It is irrational and equal to radical 7.

Answer 1

It is rational and equal to 0.

Answer 2

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

Answer 3

Thank you @eliassaab

Answer 4

\[
28 = 4 (7)\\

\sqrt{28} =\sqrt 4 \sqrt 7=2 \sqrt 7

\]

Answer 5

YW