w załącznikach :D .......................................
1.
a)
y = -3x² + 3x + 6
a = -3, b = 3, c = 6
p = -b/2a = -3/-6 = 1/2
Δ = 3² - 4 * (-3) * 6 = 9 + 72 = 81
q = -Δ/4a = -81/-12 = 6 i 3/4
odp. (1/2 , 6 i 3/4)
b)
√Δ = 9
x1 = (-3 - 9)/(-6) = -12/(-6) = 2
x2 = (-3 + 9) / (-6) = 6/ (-6) = - 1
odp. x = 2 lub x = -1
c)
y = -3x² + 3x + 6 --------- postać ogólna
y = a(x - x1)(x - x2)
y = -3(x - 2)(x + 1) --------- postać iloczynowa
y = a(x - p)² + q
y = -3(x - 1/2)² + 6 i 3/4 --------- postać kanoniczna
d) wykres w załaczniku ;)
2.
y = 2(x + 1)² - 2
y = 2(x² + 2x + 1) - 2
y = 2x² + 4x + 2 - 2
y = 2x² + 4x ------- postać ogólna
y = 2x² + 4x
y = 2x(x + 2) ------ postać iloczynowa
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1.
a)
y = -3x² + 3x + 6
a = -3, b = 3, c = 6
p = -b/2a = -3/-6 = 1/2
Δ = 3² - 4 * (-3) * 6 = 9 + 72 = 81
q = -Δ/4a = -81/-12 = 6 i 3/4
odp. (1/2 , 6 i 3/4)
b)
y = -3x² + 3x + 6
a = -3, b = 3, c = 6
Δ = 3² - 4 * (-3) * 6 = 9 + 72 = 81
√Δ = 9
x1 = (-3 - 9)/(-6) = -12/(-6) = 2
x2 = (-3 + 9) / (-6) = 6/ (-6) = - 1
odp. x = 2 lub x = -1
c)
y = -3x² + 3x + 6 --------- postać ogólna
y = a(x - x1)(x - x2)
y = -3(x - 2)(x + 1) --------- postać iloczynowa
y = a(x - p)² + q
y = -3(x - 1/2)² + 6 i 3/4 --------- postać kanoniczna
d) wykres w załaczniku ;)
2.
y = 2(x + 1)² - 2
y = 2(x² + 2x + 1) - 2
y = 2x² + 4x + 2 - 2
y = 2x² + 4x ------- postać ogólna
y = 2x² + 4x
y = 2x(x + 2) ------ postać iloczynowa