Ex 3 Va rog repede Dau coroana plus 14 puncte

16(x^2-4x+4) - (x^2+6x+9) = 5(3x^2-11x-3x+11)
16x^2-64x+64-x^2-6x-9 = 15x^2-70x+55
15x^2-15x^2-70x+70x = 55-55
0 = 0 Adevarat
16(x-2)^2 - (x+3)^2= 16*x^2- 64x +64 - x^2+6x+9 = 15x^2-70x+55
5(x-1)(3x-11) = 15x^2 - 55x - 15x + 55= 15x^2 - 70x + 55