for what value of k, -4 is a zero of polynomial x2-x-(2k+2)?

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16-06-2017
Mathematics

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for what value of k, -4 is a zero of polynomial x2-x-(2k+2)?

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apologiabiology apologiabiology · Answer 1 · 2017-06-16T10:03:22+02:00

apologiabiology apologiabiology

16-06-2017

hmm
well, um
if -4 is a zero then if we subsitute -4 for x, we should get 0

so
0=(-4)²-(-4)-(2k+2)
0=16+4-2k-2
0=18-2k
2k=18
divide by 2
k=9

k=9
the value k is 9

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