List all the factors of \(4b\). (2 marks)
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\(\ 1\ ,\ 2\ ,\ 4\ ,\ b\ ,\ 2b ,\ 4b\ , -1\ , -2\ , -4\ , -b\ , -2b\ , -4b\)
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\(\text{Listing factors in pairs}\)
\((1\ ,\ 4b)\ \ (2\ ,\ 2b)\ \ (4\ ,\ b)\)
\((-1\ ,-4b)\ \ (-2\ ,-2b)\ \ (-4\ ,-b)\)
\(\therefore\ \text{Factors are:}\)
\(\ 1\ ,\ 2\ ,\ 4\ ,\ b\ ,\ 2b ,\ 4b ,\ -1\ , -2\ , -4\ , -b\ , -2b\ , -4b\)