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a)
f(x)=x²+2x+3=(x²+2x+1)+2=(x+1)²+2 , W=(-1,2)
b)
f(x)=(x²-4x+4)-4-2=(x-2)²-6 . W=(2,-6)
c)
f(x)=-(x²+2x+1)+1+1=-(x+1)²+2 , W=(-1,2)
d)
f(x)=-4(x²-2x+1)+4+1=-4(x-1)²+5 , W=(1,5)
e)
f(x)=2(x²+4x+4)-8-7=2(x+2)²-15 , W=(-2,-15)
f)
f(x)=-2(x²+3x+(3/2)²)+9/2+2=-2(x+3/2)²+6,5 , W=(-1,5; 6,5)
g)
f(x)=x²-x=(x²-x+1/4)-1/4=(x-1/2)²-1/4 , W=(1/2, -1/4)
h)
f(x)=-2(x²-3x+9/4)+9/2=-2(x-3/2)²+4,5 , W=(1,5, 4,5)
i)
f(x)=3x²-8 , W=(0,-8)