Math, asked by harmanpreetss4321, 1 year ago

If 5 is a zero of x3 + kx2 + 2x +8 find k.​

Answers

Answered by okanupamkrgmailcom
24

k=-1.7

Step-by-step explanation:

let p (x) = x3 + kx2 + 2x +8

now -5 is zero of p(x)

that's why p(-5)= (-5)*3+ k(-5)*2 +2(-5) + 8 =0

=> -15+(-10)k +(-10)+8=0

=> -15 -10k -10 + 8=0

=> -17 -10k = 0

=> -10k =17

=> -k=17/10

=> k= -1.7

if you would find any mistake then inform me

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