Question $3(25$ marks$)$

$ay(0)=1$ and $y^{\text{'}}(0)=0.$

$y^{\text{'}\text{'}}+5y^{\text{'}}+6y=0$

Question $4(25$ marks$)$

$az$ that meets the condition $|z-2i|=|z+4i|$

$b{w}^{\frac{1}{2}}ifw=16(cos(\frac{2}{3})+isin(\frac{2}{3}))$