For what value of a is -4 a zero of the polynomial p(x)= x2– x – (2a+2)?
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p(x)=x²–x–(2a+2)=0
p(-4)=(-4)²-(-4)-(2a+2)=0
=16+4-2a-2=0
=18-2a=0
-2a=-18
a=-18/-2
a=9
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