Question

o ponto M (a2-1,3a) pertence a reta da equação x+y-3=0. calcule as coordenadas do ponto​

Answer 1

x + y -3=0 ====> x=a²-1........y=3a

a²-1 + 3a -3 =0

a² + 3a - 4 = 0

∆=3²-4.1.(-4)=25 => √∆=5

a'= -3+5/2 = 2/2= 1

a"= -3-5/2= -8/2= -4

M'(0, 3)

M"(15, -12)