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2014-04-28T19:54:11+03:00
A) x² = 4
x = √4
x = √2²
x = +/- 2

b) x² = 9
x = √9
x = √3²
x = +/- 3

c) x² = 100
x = √100
x=√10²
x = +/- 10

d) x² = 64
x = √64
x = √8²
x = +/- 8

e) x² = 1
x = √1
x = +/- 1

f) (x-1)² = 4
(x-1) = √4
(x-1) = √2²
(x-1) = +/- 2
cazul 1. x-1 = 2
x = 2 +1
x = 3
cazul 2. x-1 = -2
x = -2 + 1
x  = -1

Dar x la a2a =1, si (x-1) la a2a =4 si (2x+3) la a2a =16