Rozwiąż równanie : x^3 -8x^2+4x -32=0
x^3 -8x^2+4x -32=0x^3 -8x^2+4x=32-8x^5+4x=32-4x^5=32
x^3 - 8 x^2 + 4 x - 32 = 0
x^2 *( x - 8) + 4 *( x - 8) = 0
( x^2 + 4)*(x - 8) = 0
x - 8 = 0
x = 8
=====
bo x^2 + 4 > 0 dla każdej liczby rzeczywistej x
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x^3 -8x^2+4x -32=0
x^3 -8x^2+4x=32
-8x^5+4x=32
-4x^5=32
x^3 - 8 x^2 + 4 x - 32 = 0
x^2 *( x - 8) + 4 *( x - 8) = 0
( x^2 + 4)*(x - 8) = 0
x - 8 = 0
x = 8
=====
bo x^2 + 4 > 0 dla każdej liczby rzeczywistej x