Question

Se dau multimile A={x+12 ; 2x-3 ; 3x+15 } si B={2x+1 ; x+8 ; 5x-17} . Aflati x ( N ) astfel incat A=B .

Answer 1

A=B
x+12=2x+1
x-2x=-12+1
-x=-11 / (*-1)
x=11
V:11+12=2x11+1
23=23 (A)

2x-3=x+8
2x-x=3+8
x=11
V:2x11-3=11+8
22-3=19
19=19 (A)

3x+15=5x-17
3x-5x=-15-17
-2x=-32
x=$\frac{-32}{-2}$
x=16
V:3x16+15=5x16-17
63=63 (A)