Question

x ao quadrado - 5x-3=0 me ajudem

Answer 1

x² - 5x - 3 = 0

Δ = b² − 4ac

Δ = (−5)² −4⋅(1)⋅(−3)

Δ = 25 + 12

Δ = 37

$x = \dfrac{-b \pm \sqrt{\Delta}}{2 . a}\\ \\ \\ x = \dfrac{-(-5) \pm \sqrt{37}}{2 . 1}\\ \\ \\ x = \dfrac{5 \pm \sqrt{37}}{2}\\ \\ \\ x' = \dfrac{5 - \sqrt{37}}{2}\\ \\ \\ x' = \dfrac{5 + \sqrt{37}}{2}$

S = {$\dfrac{5 - \sqrt{37}}{2}, \ \ \ \dfrac{5 + \sqrt{37}}{2}$}