Question 493151
complex roots (those containing i) occur in conjugate pairs (a+bi and a-bi)
___ also; if r is a root, then x-r is a factor


so P(x) has four factors ___ (x + 13i)(x - 13i)[x - (5 + 10i)][x - (5 - 10i)]


multiplying the factors should give you the right result