Question

Rezolvati in R ecuatia:
(x+2)^2=x(3x+2)
(3x+4)^2-(x-5)^2=-9

Answer 1

X^2 + 4x +4=3x^2 + 2x 2x^2 - 2x -4= 0 Delta= 36 X1= (2+6)/4 =2 X2=(2-6)/4 = -1 A doua. 9×^2 + 24x + 16 - (x^2-10x+25) =-9 9x^2 +24x +16 - x^2 + 10x -25=-9 8x^2 + 34x -9=-9 8x^2 +34x= 0 Delta va fi 1156 X1= (-34+34)/16=0 X2= (-34-34)/16= -68/16= -17/4