Question

Rozwiąż równanie

a) (x-2)(x-5)(x+7)(x+12)=0

b) (2x-4)(x+3)(x-7)(8-x)=0

Answer 1

a)

(x-2)(x-5)(x+7)(x+12) = 0 

x-2 = 0   => x = 2

lub

x-5 = 0   => x = 5

lub

x+7 = 0   => x = -7

lub

x+12 = 0  => x = -12

Odp. x = -12   v   x = -7   v   x = 2   x = 5

 

b)

(2x-4)(x+3)(x-7)(8-x)= 0

2x-4 = 0  /:2

x-2 = 0   => x = 2

lub

x+3 = 0   => x = -3

lub

x-7 = 0   => x = 7

lub

8-x = 0   => x = 8

Odp. x = -3   v   x = 2   v   x = 7   v   x = 8