Lets Cross The Axis

An object moves in two dimensions according to

r(t)=(4.0t29.0)i+(2.0t5.0)j\vec{r}(t) = (4.0t^2 - 9.0)\vec{i} + (2.0t - 5.0)\vec{j}

where rr is in meters and tt in seconds. When does the object cross the xx-axis?

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