If 3 is zero of polynomial x⁴-3x³-7x²+15x+k,find k
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Answered by
6
(3)^4-3(3)^3-7(3)^2+15(3)+k=0
81-81-27+45+k=0
18+k=0
k=-18
81-81-27+45+k=0
18+k=0
k=-18
hsakhare21:
mark it as brainliest answer
I was doing the same,but from 2nd last step I was confused,whether I'm doing it right or ......... THANKYOU for clearing my doubts.
no need to thank. but mark it as brainliest answer please
definitely
but from where 27 has been came??
(7)×3×3=7×9=27
got it
7×9=63
o yes sorry
Answered by
1
Answer: K = 18
Step-by-step explanation: (3)4 - 3(3)3 - 7(3)2 + 15(3) + K = 0
81 - 81 - 63 +45 + K = 0
0 - 63 + 45 + K = 0
0 - 18 + K = 0
K = 18 + 0
K = 18
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