Question

Por favor pessoal!! Ajuda ai

Answer 1

Resposta:

a)

$\sf 3x^{2} - 7x + 2 = 0\\a = 3\\b = - 7\\c = 2$

Calcular o Δ:

$\sf \Delta = b^2 - 4ac\\\Delta = (-7)^2 - 4\times 3 \times 2 \\\Delta = 49 - 24 \\\Delta = 25$

$\sf x = \dfrac{-\,b \pm \sqrt{\Delta} }{2a} = \dfrac{-\,(-7) \pm \sqrt{25} }{2\times 3} = \dfrac{7 \pm 5}{6} \\\\x_1 = \dfrac{7+ 5}{6} = \dfrac{12}{6} = 2 \\\\x_2 = \dfrac{7- 5}{6} = \dfrac{2}{6} = \dfrac{1}{3}$

$\sf S = \bigg\{ \; 2; \; \dfrac{1}{3} \; \bigg\}$

Explicação passo-a-passo: