Please help me to get solve these and please don't use calculator.thanks.

C 1 a Consider the polynomial P ( x ) - Van9 - 18 x2 + 18 a) Find all the roots of POC ) = 0. If your answer contains any complex numbers, they must be exponential form (use the priciple value of argument ) b ) Write P(x) as a product of linear factors 2. Consider the Polynomial -> P ( x ) = 9x3 - 12x2 - 20 m + 16 a) Use the bound theorem together with the rational root theoram to give list of possible rational roots of P (x ) = 0 b ) Write PCx) as a product of linear factors. (you can make use of Descrate's rule of signs ) 3. Why is nan square matrix never normal? ( A real matrix is called normal if AAT = ATA. )