Question

5x2-2x-72=0 preciso tbm kskksks
Formulá Bhaskara

Answer 1

Resposta:

5x² -2x -72=0

coeficientes

a = 5

b = -2

c = -72

Calculando delta

Δ = b² -4ac

Δ = (-2)² -4(5)(-72)

Δ = 4 + 1440

Δ = 1444

$x=\dfrac{-b\pm\sqrt{\Delta} }{2a}\\ \\ x=\dfrac{-(-2)\pm\sqrt{1444} }{2.(5)}=\dfrac{2\pm38}{10}\\ \\ \\ x'=\dfrac{2+38}{10}=\dfrac{40}{10}=\boxed{4}\\ \\ \\ x"=\dfrac{2-38}{10}=-\dfrac{36}{10}=\boxed{-\dfrac{18}{5}}$