Mjc 2010 H2 Math Prelim Verified (2024)

When $x < 1$, both $(x - 3)$ and $(x - 1)$ are negative, so the product is positive. When $1 < x < 3$, $(x - 3)$ is negative and $(x - 1)$ is positive, so the product is negative. When $x > 3$, both $(x - 3)$ and $(x - 1)$ are positive, so the product is positive.

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