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zad.1
rozwiaz rownanie
a) 2x (x+1)= 2x do kwadratu + 4
x musi wyjsc 2
b) (x-1)(x+2)= x do kwadratu + 5
x musi wyjsc 7
c) (x+2)(x-1)= x do kwadratu + 5
x musi wyjsc 7
d) (x-5)(x-10)= x(x+5)
x musi wyjsc 2.5
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a). 2x(x+1)=2x^ +4
2x^+ 2x = 2x^ + 4
2x^ + 2x - 2x^ = 4
2x = 4 /: 2
x = 2
b). (x-1)(x+2)= x^ + 5
x^ + 2x - x - 2 = x^ + 5
x^ + 2x - x - x^ = 2 + 5
2x - x = 7
x = 7
c). (x+2)(x-1)= x^ + 5
x^ - x + 2x - 2 = x^ + 5
x^ - x + 2x - x^ = 2+5
x = 7
d).(x-5)(x-10)=x(x+5)
x^- 10x- 5x + 50 = x^ + 5x
x^ - 10x - 5x - x^ - 5x = - 50
0 = - 50
równanie sprzeczne