Question

Rezolvati multimea numerelor reale ecuatiile: a) 5x-2=7x+6
b)(x-1)²-(x+5)·(x-5)=2 c) $\frac{x}{3}- \frac{x-1}{5} =1$

Answer 1

a) 5x-2=7x+6
5x-7x=6+2
-2x=8
x=-4
b)(x-1)^2-(x+5)*(x-5)=2
X^2-2x+1-(x^2-25)=2
x^2-2x+1-x^2+25=2
-2x+26=2
-2x=2-26
-2x=-24
x=12
c)nu înteleg ce scrie