Question

z²-7z=0 ??como eu faço?

Answer 1

z²-7z=0

a=1
b=-7
c=0

Δ=b²-4.a.c
Δ=7²-4.1.0
Δ=49-0
Δ=49

x=-b-+√Δ
      2.a

x=-7-+√49
       2.1

x'=-7+7=0
       2

x''=-7-7=-14=-7
        2      2

S(0,-7)