Which number doesnt belong: 26.6 repeated, sqr(48), 51/-2, -55.1

25 ! i need asap! ! ill mark brainliest!

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.

Answer asap! show all work! find the number of complex roots, the possible number of real roots and the possible rational roots of the polynomial function. then, solve for all roots. x^3 + 2x^2 + 3x + 6 = 0