Mathematics
Factorisation of y(y - z) + 9(z - y) is
(y - z)(y + 9)
(y - z)(y - 9)
(z - y)(y + 9)
none of these
Factorisation
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Answer
y(y - z) + 9(z - y) = y(y - z) + 9(-y + z)
= y(y - z) + 9(-1)(y - z)
= y(y - z) - 9(y - z)
= (y - z)(y - 9).
Hence, Option 2 is the correct option.
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