Answer:
The last part.
Step-by-step explanation:
The error is only at the last part. Basically the answer part.
The answer should be —
[tex]13 \sqrt{5} [/tex]
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.
[tex] \sqrt{5} = x[/tex]
[tex]4 \sqrt{5} + 9 \sqrt{5} = 4x + 9x[/tex]
As we add up, we would get 13x. Thrn we convert x-term back to square root of five.
The answer would be —
[tex]13x \\ x = \sqrt{5} \\ 13 \sqrt{5} [/tex]
Remember that we don't multiply the square roots when adding or subtracting.
