Question

3 x²+15×=0
Alguém min ajuda?

Answer 1

3x² - 15x = 0

Δ = b²−4ac
Δ = (5)²−4⋅1⋅0
Δ = 25 + 0
Δ = 25


x = -b ± √Δ / 2.a
x = -5 ± √25 / 2.1
x = -5 ± 5 / 2
x' = -5 - 5 / 2
x' = -10 / 2
x' =  -5

x'' = -5 + 5 / 2
x'' = 0 / 2
x'' = 0


S = {-5, 0}

Answer 2

Olá :

Resolução :

$3 x^2+15x=0~~ :~~3\\ \\ x^2 + 5x=0 \\ \\ x(x+5)=0 \\ \\ x' = 0 \\ \\ x + 5 = 0 \\ \\ x'' = - 5 \\ \\ \\ S=\{-5,0\} \\ \\ \\ Bons~~Estudos!!$