Question

determine me |R para que os pontos A(3,1), B(m,m) e C(1,m+1)Sejam vertices de um triangulo ???

Answer 1

(m-1)/(m-3)≠[(m+1 - m)/(1-m)]

(m-1)/(m-3)≠[(1 )/(1-m)]

(m-1)(1-m)≠(m-3)

-(m-1)(m-1)≠(m-3)

-m²-1≠(m-3)

-m²-m+2≠0

m²+m-2≠0

m'=[-1+(1+8)¹/²]/2=1

m"=[-1-(1+8)¹/²]/2=-2