Question

which of the following is a radical equation? 1. x+sqrt(5)=12 2. x^2=16 3. 3+xsqrt(7)=13 4. 7sqrt(x)=14

Answer 1

Number 4, 7√x=14, because the x is inside the root.

Answer 2

4.
`7√(x)=14`

Explanation:

Radical equation is a equation that has a variable under the radical .

From the given options we have radical square root

We need to choose an option that has a variable under the square root.

1.
`x+√(5)=12`

This equation has 5 under the radical square root. Variable is outside, So this is not a radical equation.

2. x^2=16

Here there is not radical . So this is not a radical equation.

3.
`3+x√(7)=13`

This equation has 7 under the radical square root. Variable is outside, So this is not a radical equation.

4.
`7√(x)=14`

This equation has x under the radical square root. So this is a radical equation.