Question

Rozwiąż równanie: x2-1=0 x2-4=0 x2-9=0 x2-16=0

Answer 1

a)

x^2 -1 = 0

(x+1)(x-1) = 0

x+1 = 0

x = -1

====== lub

x-1 = 0

x = 1

======

b)

x^2 -4 = 0

(x+2)(x-2) = 0

x+2 = 0

x = -2

====== lub

x-2 = 0

x = 2

======

c)

x^2 -9 = 0

(x+3)(x-3) = 0

x+3 = 0

x = -3

===== lub

x-3 = 0

x = 3

=====

d)

x^2 -16 = 0

(x+4)(x-4) = 0

x+4 = 0

x = -4

====== lub

x-4 = 0

x = 4

======