Question

Determinati numarul real m pentru care
a) ecuatia 2x + m = 4x + 3 are solutia -2
b) ecuatia 2x + 5(x-1) = 7x + 1 - 3m are solutia 1
c) ecuatia m (x+2) + 3 (x-1) = mx-3 are solutia 0

Answer 1

a) x= -2,
-4 +m = -8 +3
m=-5 + 4
m= -1

b) x = 1
2 + 5 *0 = 7+1-3m
2= 8-3m
3m = 8-2
3m =6
m = 2

c) x = 0
m * 2 + 3 * (-1) = -3
2m -3 = -3
2m = 0
m= 0