Question

formula de bhaskara com 7xelevado a dois -21x=0

Answer 1

7x² - 21x = 0

a = 7
b = -21
c = 0

Δ = b² - 4ac
Δ = (-21)² - 4.(7).(0)
Δ = 441

$x = \dfrac{-b \frac{+}{-} \sqrt{b^2-4ac} }{2a}$

$x = \dfrac{-(-21) \frac{+}{-} \sqrt{441} }{2.7}$

$x = \dfrac{21 \frac{+}{-} 21 }{14}$

x' = 0

x" = 42/14

x" = 3

S = {0,3}