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y= x² - x -3x+3
y= x² -4x +3
p=4/2=2
delta= 16-4(3)=4
q= -4/4=-1
y= (x-2)² -1
b) y=2x²-8x-24
delta=64-4(-48)=64+192=256
p=8/4=2
q=-256/8=-32
y= 2(x-2)² -32
c) y=-2x² -4x+30
delta= 256
p=4/-4=-1
q=-256/-8=32
y= -2(x+1)²+32
d) y=-x²-3x-2
delta= 1
p=3/-2
q= 1/4
y= -(x+3/2)+1/4