Question

PLZ HALP :(

What number can you multiply by 7√ to get a rational number?
Select each correct answer.

−7√

0

7√

7

Answer 1

The answers are -√7, 0, √7. i just took the test so I know these are right.

Answer 2

In this item, I assume that the number written is square root of 7. Square root of 7 is an irrational number that when multiplied to itself will give a rational value. That is,

(square root of x)(square root of x) = x

By using the same principle,

(square root of 7)(square root of 7) = 7

7 now as the answer is a rational number.

Thus, the answer is the third choice.