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If (r − 8) is a factor of : Multiple-choice Questions — Select One Answer Choice

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Re: If (r − 8) is a factor of [#permalink]
1
ok, this is a shortcut
notation-wise, it's
\(64 - 8k - 56 = 0\)

\(8 -8k = 0\)

\(k = 1\)

rx10 wrote:
\(r - 8\) is a factor of the given equation.

\(r^2-kr-56\)

put \(r = 8\)

\(64 - 8r - 56 = 0\)

\(8 -8r = 0\)

\(r = 1\)

Answer D
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Re: If (r − 8) is a factor of [#permalink]
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