Question

which statements are true ?? please help me!
√9 is a rational #
√-1 is NOT a rational #
√ab=√a *√b
√a+b=√a+√b
9y√3 and 9√3y are like radicals
^3√5 is the symbol for the square root of 5
√a-b ≠ √a-√b

Answer 1

You asked this yesterday?!

Answer 2

and i didnt get help
could you help me ?>

Answer 3

wai!

Answer 4

Any number that is integer or a fraction can be made by dividing one integer by another is Rational Number. The word comes from "ratio" ( p/q form)
The first Option
√9 = +3 or -3 as we know (3)^2 = 9
so the answer is integer and we can write it as +3/1 or -3/1 so it is rational!

Answer 5

√-1 is the complex number i which doesnt have any value and cant be expressed in fraction form
So its not rational

Answer 6

==> √ab=√a *√b
check it by taking some arbitrary values
for ex by taking a =9 and b = 16 ( took perfect squares for simplification)
then √ab = √9*16 = √144 = 12
and √a = √9 = 3
√b =√16 = 4
√a *√b = 3*4 = 12
so what would that makes?
√ab=√a *√b is a true relation ( it is an algebra rule that u have to remember!)

Answer 7

and the same goes for √a+b=√a+√b
and √a-b ≠ √a-√b these are also true correct?

Answer 8

no same does not goes for what u said

Answer 9

\[\sqrt{a+b}\neq \sqrt{a}+\sqrt{b}\]
generally
\[\sqrt{a+b}\le \sqrt{a}+\sqrt{b}\]

Answer 10

Same i told applies for last option!
√a-b ≠ √a-√b is true

Answer 11

Like Radicals : IF the number in the radical and its signs are equal , then we say that the two radicals are like radicals.

9y√3 and 9√3y have same radical sign and number in the radical also is same. therefore these two are like radicals

Answer 12

square root of 5 is written as ^2√5 not ^3√5 ( ^3√5 represents the cubeth root of 5 )

Answer 13

Are all clear?

Answer 14

yes these are all true
√9 is a rational #
√-1 is NOT a rational #
√ab=√a *√b

9y√3 and 9√3y are like radicals

√a-b ≠ √a-√b

Answer 15

you have extremely helpful thank you for taking the time out and explaining it to me