find a polynomial, p(x), of degree 3 with zero of 4, 1 and-1 if p(0) =8

Question

(a)Express -2-2i in trigonometric form

(b) Calculate (-2-2i)16 ,without using a calculator. Express the answer in the a+ib form.

Answer 1

(x-1)*(x+1)*(x-4)=konst

(x^2-1)*(x-4)=konst

x^3 -4x^2 -4x+4=sumthun

y(0) =8...so sumthun=8

stuf abuv evaluated at x=0 giv 4, so need tu add 4 & that meen equashun=-4