The polynomial function q(x)= x^4+ax^3-19x^2-46x+120 has a root of -4. What is the value of the missing coefficient, a? Show your work and explain your reasoning.
Raise x to the 2nd power
x4-4x3-19x2+106x-120 ("Dividend")By : x-4 ("Divisor")
a = 19
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