Question

given that x-root 5 is a factor of x³-3root5x²-5x+15root5​

Answer 1

Answer:

it isn't

Step-by-step explanation:

dividing

${x}^{3} - 3 \sqrt{5} {x}^{2} - 5x + 15 \sqrt{5} \: by \: x \sqrt{5}$

gives remainder

$20 \sqrt{5}$

so it can't be root...