For what value of p,-4 is a zero of the polynomial x square-2x-(2p+3)

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01-05-2018
Mathematics

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For what value of p,-4 is a zero of the polynomial x square-2x-(2p+3)

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calculista calculista · Answer 1 · 2018-05-10T19:36:06+02:00

calculista calculista

10-05-2018

we have that
x²-2x-(2p+3)

if -4 is a zero of the polynomial
so
for x=-4
x²-2x-(2p+3)=0----> (-4)²-2*(-4)-(2p+3)=0-----> 16+8-2p-3=0
21-2p=0
2p=21
p=21/2-----> p=10.5

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