2x+a la puterea a doua+ab+ac=60 si a=4;b+c=8

Răspuns :

2x + a² + ab + ac = 60

2x + 4² + a · (b+c) = 60

2x + 16 + 4 · 8 = 60

2x=60 - 48

x =12 ÷ 2

x= 6