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Atymic · Answer 1 · 2018-05-03T09:01:22+0000

notice the graph, the domain is just the horizontal area "used up" over the x-axis, so, the graph goees from
$\bf -\cfrac{5x}{2}\quad to\quad \cfrac{5x}{2}\implies domain\implies \left[-\cfrac{5x}{2}\ ,\ \cfrac{5x}{2}\right]$

the range is just, the vertical area "used up" over the y-axis, so, the graph goes to 2 and down to -2, thus
$\bf range\implies [2\ ,\ -2]$

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