if 3 is a zero of polynomial 2x square + x + k find the value of k

Step 1= put divisor = 0
X- 1=0
X=1
Step 2= let px =Xsqaure + X+ K
=
Putting x=1
P1= 1 square +1 + k
1 + 1 + k
  • 1
Please find this answer

  • -1
minus 19
  • -2
Ok
I did an error
Its ? 21
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p(x)=3

As 3 is the zero of the polynomial,so it's total value is equal to 0

p(x)=2*3*3+3+k
0=18+3+k
21+k=0
k=0-21
k=-21
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-21
 
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