Question

pls answer as soon as possible​

Answer 1

Step-by-step explanation:

$x( \sqrt{5} ) = ( \sqrt{5} ) {}^{3} - 3 \sqrt{5} ( \sqrt{5} ) {}^{2} + 13 \sqrt{5} - 3 \sqrt{5}$

$= 5 \sqrt{5} - 15 \sqrt{5} + 13 \sqrt{5} - 3 \sqrt{5 } \\ = 18 \sqrt{5} - 18 \sqrt{5}$