Question

Resolva as equações:
A)x²-784=0
B)5x²-90x=0
C)x²-12x+35=0

Answer 1

Olá! ✨

a) x²-784=0
x²=784
x= + - √784
x= + - 28

S={-28,+28} <---

b) 5x²-90x=0
x.(5x-90)=0
5x-90=0
x'=0
5x-90=0
5x=90
x=90/5
x=18

S={0,18} <---

c) x²-12x+35=0

a=1
b= -12
c=35

Δ=144-4.35
Δ=4

x'= 12+2 /2
x'=7

x"=12-2 /2
x"=5

S={5,7} <---