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Q1 E of 52 Page 131

Let’s resolve into factors:
9r² + r-8

9r² + r-8

=9r² + 9r-8r-8

=9r(r + 1)-8(r + 1)

=(9r-8)(r + 1)

∴ the factors of 9r² + r-8 are (9r-8)(r + 1)

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