Odpowiedź:
Δ=b²-4ac
a]
a=1 b=3 c=2
Δ=9-4*2=1
b)
a=2 b=5 c=1
Δ= 25-4*2=17
c)
a=1 b=-6 c=6
Δ= 36-4*6=12
d)
a=-2 b=4 c=-3
Δ= 16-4*2*3= -8
e)
a=-1/2 b=0 c=1/2
Δ= 0+ 4*1/2*1/2= 1
f)
a=1 b=-1 c=0
Δ= 1-4*1*0=1
Szczegółowe wyjaśnienie:
zad 1
a)
y = x² + 3x + 2
a = 1 ,b = 3 , c = 2
Δ = b² - 4ac = 3² - 4 * 1 * 2 = 9 - 8 = 1
y = 2x² + 5x + 1
a = 2 , b = 5 , c = 1
Δ = b² - 4ac = 5² - 4 * 2 * 1 = 25 - 8 = 17
y = x² - 6x + 6
a = 1 , b = - 6 , c = 6
Δ = b² - 4ac = (- 6)² - 4 * 1 * 6 = 36 - 24 = 12
y = - 2x² + 4x - 3
a = - 2 , b = 4 , c = - 3
Δ = b² - 4ac = 4² - 4 * (- 2) * (- 3) = 16 - 24 = - 8
y = - 1/2x² + 1/2
a = - 1/2 , b = 0 , c = 1/2
Δ = b² - 4ac = 0² - 4 * (- 1/2) * 1/2 = - 4 * (- 1/4) = 1
y = x² - x
a = 1 , b = - 1 , c = 0
Δ = b² - 4ac = (- 1)² - 4 * 1 * 0 = 1 - 0 = 1
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Verified answer
Odpowiedź:
Δ=b²-4ac
a]
a=1 b=3 c=2
Δ=9-4*2=1
b)
a=2 b=5 c=1
Δ= 25-4*2=17
c)
a=1 b=-6 c=6
Δ= 36-4*6=12
d)
a=-2 b=4 c=-3
Δ= 16-4*2*3= -8
e)
a=-1/2 b=0 c=1/2
Δ= 0+ 4*1/2*1/2= 1
f)
a=1 b=-1 c=0
Δ= 1-4*1*0=1
Szczegółowe wyjaśnienie:
Verified answer
Odpowiedź:
zad 1
a)
y = x² + 3x + 2
a = 1 ,b = 3 , c = 2
Δ = b² - 4ac = 3² - 4 * 1 * 2 = 9 - 8 = 1
b)
y = 2x² + 5x + 1
a = 2 , b = 5 , c = 1
Δ = b² - 4ac = 5² - 4 * 2 * 1 = 25 - 8 = 17
c)
y = x² - 6x + 6
a = 1 , b = - 6 , c = 6
Δ = b² - 4ac = (- 6)² - 4 * 1 * 6 = 36 - 24 = 12
d)
y = - 2x² + 4x - 3
a = - 2 , b = 4 , c = - 3
Δ = b² - 4ac = 4² - 4 * (- 2) * (- 3) = 16 - 24 = - 8
e)
y = - 1/2x² + 1/2
a = - 1/2 , b = 0 , c = 1/2
Δ = b² - 4ac = 0² - 4 * (- 1/2) * 1/2 = - 4 * (- 1/4) = 1
f)
y = x² - x
a = 1 , b = - 1 , c = 0
Δ = b² - 4ac = (- 1)² - 4 * 1 * 0 = 1 - 0 = 1