Răspuns :

Răspuns:

Explicație pas cu pas:

a) x+2x+3=7x+9

3x + 3 = 7x + 9

7x - 3x = 3 - 9

4x = -6

x = -6/4 = -3/2

b) x(x+1)=3+x²

x^2 + x = 3 + x^2

x = 3

c) x²+2x+1=0

(x + 1)^2 = 0

x = -1

d) x²+3x=0

x(x + 3) = 0

x1 = 0

x2 = -3

e) x²=16

x1 = 4

x2 = -4

f) x²=-16

nu are solutii in R

g) x²=-1

nu are solutii in R

j) x²=1

x1 = 1

x2 = -1

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