19. For the function: f(x) = 2x4 + 11x³ +14x²-9x-18. a) Use your calculator to sketch the graph of this polynomial function. b) Write the polynomial in factored form with integral coefficients. Explain your steps. 20. Prove that r²-7x+12 is a factor of x-2³-17x² + 18x + 72. (

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