Question

Calcule a raiz da seguinte equação do segundo grau incompleta * 3x² - 15=0

Answer 1

Resposta ↓

Valor de x = (√5, - √5)

Explicação passo-a-passo:

3x² - 15 = 0

3x² = 15

x² = 15 / 3

x² = 5

x = ± √5

x' = + √5

x" = - √5

Answer 2

$\boxed{\begin{array}{lr} 3x^2 - 15 = 0\\3x^2= 15\\x^2 = \frac{15}{3}\\x^2 = 5\\x =\pm \sqrt{5}\\x'=+\sqrt{5}\ \ \checkmark\\x''=-\sqrt{5}\ \ \checkmark \end{array}}\\\\\\Rsposta;\\\boxed{\begin{array}{lr} x'=\sqrt{5}\ \ \checkmark \\x''=-\sqrt{5}\ \ \checkmark\\\\S=\{\sqrt{5},-\sqrt{5}\}\end{array}}$