Question

pomożecie mi :

a )x2= (1-x)(1+x)

B) (X-1)2-1=0

C) (2x+3)2 =(x-3)2

Answer 1

a) x2=1-x2

2x2=1      /2

x2=1/2       /pierwiastek z 2

x = pierwiastek z 1/2

b) x2 - 2x + 1 - 1 = 0  albo        2x - 2 - 1 = 0

x = 0                                       2x=3   =>   x=2/3

c) 4x2 + 12x + 9 = x2 - 6x +9           albo                 4x + 6 = 2x - 6

3x2 + 18x = 0                                                         2x = - 12  / :2

x = 0                                                                       x = -6