Question

Rezolvati in multimea numerelor intregi urmatoarele ecuatii :
a) 2x+3=x-5
b)3(x+1)=4x(x-2)
c) 5x+2=3x-5
d)3x-4=7x-20

Answer 1

a)2x-x=-5-3⇔x=-8
b)3x+3=4x^2-8x⇔4x^2-11x-3=0
Δ=121+48=169
x1=3;x2=-1/4
c)5x-3x=-5-2⇔2x=-7⇔x=-3,5
d)3x-7x=-20+4⇔-4x=-16⇔x=4