Question

ma poate ajuta cineva cat mai repede ? mersi mult

Answer 1

Vectorii u si v sunt perpendiculari daca u*v = 0. => a*(-5a+1)+(a+1)*2 = 0 -5a² + a +2a + 2 = 0 -5a² +3a +2 = 0 |*(-1) 5a² -3a -2 = 0 Delta = 9-4*5*(-2) = 9+40=49 a1 = (3+7)/10 = 10/10 = 1 a2 = (3-7)/10 = -4/10 = -2/5