Question

Rezolvați în mulțimea Nr naturale ecuatiile:
a)2(x+3)-3(x-1)=3x-2(2+x)
b)(x+2)^2+3(x-2)=(x+1)(x+1)-8

Answer 1

Răspuns:

a)2(x+3)-3(x-1)=3x-2(2+x)

2x+6-3x+3=3x-4-2x

-x+9=x-4

-x-x=-4-9

-2x=-13

x=13/2

b)(x+2)²+3(x-2)=(x+1)(x+1)-8

x²+4x+4+3x-6=(x+1)²-8

x²+4x+4+3x-6=x²+2x+1-8

4x+4+3x-6=2x+1-8

7x-2=2x-7

7x-2-2x+7=0

5x+5=0

x+1=0

x=-1