Question

3x ao quadrado -7x +2=0

Answer 1

$3x^2 - 7x + 2 = 0$

Resolvendo por Bháskara:

$x = \dfrac{-b \pm \sqrt{b^2 -4*a*c}}{2*a}$

a=3, b=−7, c=2

Δ=b²−4ac
Δ=(−7)²−4*(3)*(2)
Δ=49−24
Δ=25

$x = \dfrac{-b \pm \sqrt{\triangle}}{2*a}$

$x = \dfrac{-(-7) \pm \sqrt{25}}{2*3} \\ \\ \\ x = \dfrac{7 \pm 5}{6} \\ \\ \\ x' = \dfrac{7 + 5}{6} \\ \\ \\ x' = \dfrac{12}{6} \\ \\ \\ x' = 2 \\ \\ \\ x'' = \dfrac{7 - 5}{6} \\ \\ \\ x'' = \dfrac{2}{6} \\ \\ \\ x'' = \dfrac{1}{3}$


S = {$2, \ \ \dfrac{1}{3}$}