Question

resolva as equações 2°- grau:. a) 5x-80=0. b) x2=225 c) 4x- 324=0 ​

Answer 1

a) 5x-80 = 0

5x = 80

x = 80/5

x = 16

b) x² = 225

x = +-√225

x = +-15

x' = -15

x" = +15

S = {-15,+15}

c) 4x-324=0

4x = 324

x = 324/4

x = 81

Boa Semana ❤️❤️

23/10/22

Answer 2

a) 5x² - 80=0

5x²=80

x²= 16

x=√16

"x= +/-4"

R.:: s={4; -4}

_____________

b) x²=225

x=√225

x=+/- 15

R.:

s={15;-15}

c) 4x² - 324=0

​4x²= 324

"x²= 324/4"

"x²= 81 "

x=√81

"x = +/-9"

R.:

S={9; -9}