w(x)-3(x-7)²)(1-x²)(x²-5x+6) podaj pierwiastki wielomianu i określ wilokrotność
w(x)=-3(x-7)²)(1-x²)(x²-5x+6)
-3(x-7)²)(1-x²)(x²-5x+6) =0 /:-3
(x-7)²)(1-x²)(x²-5x+6)=0
(x-7)²=0 U (1-x²)=0 U (x²-5x+6)=0
x-7=0 (1-x)(1+x)=0 Δ=b²-4ac=25-24=1 √Δ=1
x = 7 1-x=0 U 1+x=0 x1=(-b+√Δ)/2a=(5-1)/2=4/2=2
(podwójny) x=1 x=-1 x2=(-b+√Δ)/2a=(5+1)/2=6/2=3
pierwiastki wielomianu w(x) to :
x=7 - podwójny
x=1 - pojedynczy
x=-1 - II -
x=2 - - II-
x=3 - -II=
W(x) = -3(x-7)²·(1-x²)(x²-5x+6)
W(x) = 0
x²-5x+6 = 0
Δ = b²-4ac = 25-24 = 1
√Δ = 1
x1 = (-b-√Δ)/2a = (5-1)/2 = 4/2 = 2
x2 = (-b+√Δ/2a = (5+1)/2 = 6/2 = 3
W(x) = -3(x-7)²·(x+1)(x-1)(x-2)(x-3) = 0
(x-7)² = 0 => x = 7 - pierwiastek 2 - krotny
lub
x+1 = 0 => x = -1 - pierwiastek 1-krotny
x-1 = 0 => x = 1 - pierwiastek 1-krotny
x-2 = 0 => x = 2 - pierwiastek 1-krotny
x-3 = 0 => x = 3 - pierwiastek 1-krotny
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w(x)=-3(x-7)²)(1-x²)(x²-5x+6)
-3(x-7)²)(1-x²)(x²-5x+6) =0 /:-3
(x-7)²)(1-x²)(x²-5x+6)=0
(x-7)²=0 U (1-x²)=0 U (x²-5x+6)=0
x-7=0 (1-x)(1+x)=0 Δ=b²-4ac=25-24=1 √Δ=1
x = 7 1-x=0 U 1+x=0 x1=(-b+√Δ)/2a=(5-1)/2=4/2=2
(podwójny) x=1 x=-1 x2=(-b+√Δ)/2a=(5+1)/2=6/2=3
pierwiastki wielomianu w(x) to :
x=7 - podwójny
x=1 - pojedynczy
x=-1 - II -
x=2 - - II-
x=3 - -II=
W(x) = -3(x-7)²·(1-x²)(x²-5x+6)
W(x) = 0
x²-5x+6 = 0
Δ = b²-4ac = 25-24 = 1
√Δ = 1
x1 = (-b-√Δ)/2a = (5-1)/2 = 4/2 = 2
x2 = (-b+√Δ/2a = (5+1)/2 = 6/2 = 3
W(x) = -3(x-7)²·(x+1)(x-1)(x-2)(x-3) = 0
(x-7)² = 0 => x = 7 - pierwiastek 2 - krotny
lub
x+1 = 0 => x = -1 - pierwiastek 1-krotny
lub
x-1 = 0 => x = 1 - pierwiastek 1-krotny
lub
x-2 = 0 => x = 2 - pierwiastek 1-krotny
lub
x-3 = 0 => x = 3 - pierwiastek 1-krotny