13. If x = 7 is a root of x-3x2 -7x + 21 = 0, use synthetic division to factor the polynomial completely and list all real solutions of the equation. 14. Using the factors (x+5) and (x+2), find the remaining factor(s) of f(x) = x³ + 6x2 + 3x – 10 and write the polynomial in fully factored form 15. Find all zeros of the function f (x ) =( x+2)( x+ 3i ) ( x- 3i ). 16. Find all zeros of the function f(x) = x²(x + 2)(x3 – 216) 17. Find all the real zeros of f(x) = 6x3 + 8x? + 6x + 8 18. Find all the rational zeros of the function f (x) = 2x5 + 3x* – 9x3 – 3x? – 11x – 6 19. Given -5i is a root, determine all other roots of f(x) = x³ + 5x2 + 25x + 125

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