What number can you multiply by −√2 to get a rational number? Select each correct answer.


A. 12
B. √2
C. 0
D. 2

Respuesta :

we know that

A rational number is any number that can be expressed as a ratio of two integers

so

case A) [tex]12[/tex]

[tex]-\sqrt{2}*(12)=-12 \sqrt{2}[/tex] -----> is not a rational number

case B) [tex]\sqrt{2}[/tex]

[tex]-\sqrt{2}*(\sqrt{2})=-4[/tex] -----> is a rational number

because can be written as a quotient of two integer numbers. For example

[tex]-4=\frac{-8}{2}[/tex]

case C) [tex]0[/tex]

[tex]-\sqrt{2}*(0)=0[/tex] -----> is a rational number

because can be written as a quotient of two integer numbers. For example

[tex]0=\frac{0}{1}[/tex]

case D) [tex]2[/tex]

[tex]-\sqrt{2}*(2)=-2 \sqrt{2}[/tex] -----> is not a rational number

therefore

the answer is

[tex]\sqrt{2}[/tex]

[tex]0[/tex]

Every number that can be expressed as a ratio of the two numbers is a rational number, and the calculation to the points can be defined  as follows:

For point A:

[tex]\to - \sqrt{2} \times 12 = - 12 \sqrt{2}[/tex] is not a rational.

For point B:

[tex]\to - \sqrt{2} \times \sqrt{2} = - 4[/tex] is a rational.

since it can be expressed as a quotient of 2 integers.

Example:

[tex]\to -4 =- \frac{8}{2}[/tex]

For point C:

[tex]\to - \sqrt{2} \times (0) =0[/tex] that is a rational.

since it can be expressed as a quotient of 2 integers.

Example:

[tex]\to 0 =\frac{0}{1}[/tex]

For point D:

[tex]\to - \sqrt{2} \times (2) = -2\sqrt{2}[/tex] that is not a rational.

Therefore, the answer is "Option B and Option C".

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