Question

if one of the zero polynomial 3 X square + 5 x + K is minus 1 then find the value of k​

Answer 1

P(x)=3x^2+5x+k

P(-1)=3(-1)^2+5(-1)+k

P(-1)=3(1)+5(-1)+k

P(-1)=3-5+k

P(-1)=-2+k=0

P(-1)=k=2

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Answer 2

$\huge{\mathfrak{\underline{\red{Answer!}}}}$

P(x)=3x^2+5x+k

P(-1)=3(-1)^2+5(-1)+k

P(-1)=3(1)+5(-1)+k

P(-1)=3-5+k

P(-1)=-2+k=0

P(-1)=k=2

I hope it's help you

Plz mark my answer as a brainliest answer