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a)
f(x)=(x²-6x+9)-9+10=(x-3)²+1
W=(3,1)
b)
f(x)=2(x²+2x+1)-2-1=2(x+1)²-3
W=(-1,-3)
c)
f(x)=-(x²+2x+1)+1-3=-(x+1)²-2
W=(-1,-2)
d)
f(x)=1/2(x²-2x+1)-1/2+9/2=1/2 (x-1)²+4
W=(1,4)