Zapisz wzor funkcji kwadratowej w postaci kanonicznej :
a) y=x^{2}-x-9
b)y=x^{2}-x+1/4
c)y=x^{2}-5x+5
d)y=x^{2}-5x
e)y=x^{2}+7x
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a)
p=-b/2a = 1/2
Δ=1+36=37
q=-Δ/4a = -37/4
więc:
y=(x-1/2)²-37/4
b)
Δ=1-1=0
p=1/2
q=0/4=0
wiec:
y=(x-1/2)²
c)
Δ=25-20=5
p=5/2
q=-5/4
więc:
y=(x-5/2)²-5/4
d)
Δ=25-0=25
p=5/2
q=-25/4
więc:
y=(x-5/2)-25/4
e)
Δ=49-0=49
p=-7/2
q=-49/4
więc:
y=(x+7/2)-49/4