Question

determine as raizes da função quadratica f (x)=7x2+7x-14

Answer 1

F (x) = 7x² + 7x - 14

Δ = 7² - 4.7.-14

Δ = 49 + 392

Δ = √441 = 21

x' = $\frac{-7+21}{2.7}$

x' = $\frac{14}{14}$ = 1

x" = $\frac{-7-21}{2.7}$

x" = $\frac{-28}{14}$ = -2