Question

Find the error and explain why its wrong

Answer 1

The last part.

Explanation:

The error is only at the last part. Basically the answer part.

The answer should be —

`13 √(5)`

We don't multiply the square roots when adding or subtracting. That'd contradict the rules.

Here, we let the square root of five as x-term.

`√(5) = x`

`4 √(5) + 9 √(5) = 4x + 9x`

As we add up, we would get 13x. Thrn we convert x-term back to square root of five.

The answer would be —

`13x \\ x = √(5) \\ 13 √(5)`

Remember that we don't multiply the square roots when adding or subtracting.