Rozłóż wielomiany na czynniki.
a) w(x)= 3x(x+2) - 4(x+2)
b) w(x)= 4x^2(x^2-1)+2(x^2-1)
c) w(x)=(x^3+27)(x^2+6x+9)
d) w(x)= 3x^3+6x^2-9x-18
e) w(x)= 2x^3+4x^2+18x+36
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a)
b)
c)
d)
e)
a]
3x(x+2)-4(x+2)=(3x-4)(x+2)=[√(3x)+2][√(3x)-2](x+2)
b]
4x²(x²-1)+2(x²-1)=(4x²+2)(x+1)(x-1)
c]
(x³+27)(x²+6x+9)=(x+3)(x²-3x+9)((x+3)²=(x+3)³(x²-3x+9)
Δ=b²-4ac=36-36=0
x₀=-b/2a=- 6/2=-3
x³+27=(x+3)(x²-3x+9)
d]
3x³+6x²-9x-18=3x²(x+2)-9(x+2)=(3x²-9)(x+2)=(x√3+3)(x√3-3)(x+2)
e]
2x³+4x²+18x+36=2x²(x+2)+18(x+2)=(2x²+18)(x+2)