Question

vetor normal ao plano PI

Answer 1

Resposta:

a)

AB=(0,-1,0)

AC=(0,1,2)

x    y    z     x   z

0   -1    0     0   -1

0    1    2     0    1

det=-2x+0+0-0-0-0 =-2x  

vetor normal (-2,0,0)

c)

x-2y+4z+1=0

vetor normal ==>(1,-2,4)