Explanation:
y= x^2+5x-7
the vertex is -2.5 , -13.25
solutions ( -6.14 , 0) and (1.14 , 0 )
..........
y= -x^2+3x+8
vertex(1.5 ,10.25)
solutions ( -1.7 , 0) and (4.7 ,0 )
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