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1. $\displaystyle f(x) = k(x+1)^3 (x-3)^2$ where k is some constant ...
$\displaystyle f(-2) = 50 = k(-2+1)^3(-2-3)^2$
solve for k.
2. a. $\displaystyle x^4 - 13x^2 + 36 = (x^2 - 9)(x^2 - 4)$
finish.
b. $\displaystyle 6x^5 - 7x^3 - 3x = x(6x^4 - 7x^2 - 3) = x(2x^2-3)(3x^2+1)$
finish.