Resposta :
a) x² = 36
x = √36
x = +-6
S = {-6,+6}
b) x²-289 = 0
x² = 289
x = +-√289
x = +-17
S = {-17,+17}
c) x²-20 = 236
x² = 236+20
x² = 256
x = +-√256
x = +-16
S = {-16,+16}
d) 3x²+10 = 475
3x² = 475-10
3x² = 465
x² = 465/3
x² = 155
x = +-√155
x = +- 12,44
S = {-12,44;+12,44}
Bom estudo ✨
30/07
S { -12,44;+12,44}
