Question

4x ao quadrado -12+7=0

Answer 1

Vamos lá!

4x² - 12 + 7 = 0
4x² - 5 = 0
4x² = 5
x² = 5 ÷ 4
x² = 1,25
x = √1,25
x = 1,1180..

Answer 2

4x² - 12 + 7 = 0

4x² - 5 = 0

4x² = 0 + 5

4x² = 5

${x}^{2} = \frac{5}{4} \\ x = \pm \: \sqrt{ \frac{5}{4} } \\ \bf{x = \pm \: \frac{ \sqrt{5} }{2} }$

$\bf{S= \{ - \frac{ \sqrt{5} }{2} ,\: \frac{ \sqrt{5} }{2} \} }$