Question

Zrobi ktoś te przykłady? a) (x-1) (x²-5x+4) = 0 b) (x+3) (x²-3x+2) = 0 c) (x-5) (x²+6x+5) = 0 d) (x-3) (x²+5x+4) = 0 e) x(x²-3x) = 0

Answer 1

a)

(x-1) (x²-5x+4) = 0

x³-5x²+4x - x² + 5x - 4 = 0

x³-6x² + 9x = 4

b)

(x+3) (x²-3x+2) = 0

x³-3x² + 2x + 3x² - 9x + 6 = 0

x³ - 7x = -6

c)

(x-5) (x²+6x+5) = 0

x³ + 6x² + 5x - 5x² - 30x² - 25 = 0

x³ - 29x² + 5x = 25

d)

 (x-3) (x²+5x+4) = 0

x³ + 5x² + 4x - 3x² - 15x - 12 = 0

x³ + 2x²  - 11x = 12

e)

x(x²-3x) = 0

x³-3x² = 0