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