When y=0, 0= 1/2x? -x-4 Solve the intersection of x 1=4 x2=-2 ∴ and X axis and (4,0) (-2,0).
When x=0, y=-4. The ∴ intersection point with the Y-axis sum (0, -4)
Then draw a sketch, just trace the three points and vertices of the coordinate axis and connect them.
(2) when x > 1, y increases with the increase of x, and when x < 1, y decreases with the increase of x.
When x= 1, the minimum value of y =-9/2.
At least give me some reward!