Question

rezolvati in multimea nr reale ecuatia x compus x= x Urgent

x compus y = xy+4x+4y+12

x compus y= (x+4)(y+4)-4

Answer 1

x compus x=(x+4)^2 -4=x^2+8x+12=x
x^2+7x+12=0
delta=49-4×12=1
x1= (-7+1)/2=-3
x2=(-7-1)/2=-4