Question

Fie functiile f:R-R,f(x)=x+3 si g:R-R,g(x)=2x-1.Sa se determine solutia reala a ecuatiei 2f(x)+3g(x) =-5

Answer 1

f(x)=x+3

g(x)=2x-1

2f(x)+3g(x) =-5

2x+6+6x-3=-5

8x+3=-5

8x=-8

x=-1

S={-1}