1.Dane są wielomiany :
W(x)= 3x ² - 5x+1
P(x) = x-2
Q(x) = 7x ³+5x²+2x-1
Wyznacz :
a) W(x) + P(x) =
b)P(x)-Q(x)=
c) W(x) * P(x)+ Q(x)
2.Rozwiąż równania :
a) (x-7) (x+5) (2x-6)=0
b) (x+3) (x²-4x+4)=0
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a) W(x) + P(x) = 3x ² - 5x+1 + x-2 = 3x² - 4x - 1
b)P(x)-Q(x)= x-2 - 7x ³-5x²-2x+1 = -7x³ - 5x² - x - 1
c) W(x) * P(x)+ Q(x) = (3x ² - 5x+1) * (x-2) + 7x ³+5x²+2x-1 = 3x³ - 6x² - 5x² + 10x + x - 2 + 7x³+5x²+2x-1 = 10x³ - 6x² + 13x - 3
2.
a) (x-7) (x+5) (2x-6)=0
rozw:
x = 7
x = -5
x = 3
b) (x+3) (x²-4x+4)=0
rozw:
x = -3
x² - 4x+ 4 = (x-2)²
(x-2)² = 0
|x-2| = 0
x - 2 = 0
x = 2