Question

d.3 x² - 15 x + 12 = 0

equação do 2 grau

Answer 1

3x²-15x+12=0
a=3 b=-15 c=12
∆=b²-4.a.c
∆= (-15)²-4.3.12
∆= 225-2184
∆= -2359

Answer 2

(-15)2 -4 . 3 .12
225 - 114
$\sqrt{81}$

$x= \frac{-(-15+ \sqrt{81} )}{2.3}= \frac{15+9}{6} = \frac{24}{6} =4$

$x= \frac{-(-15)- \sqrt{81} }{2.3} = \frac{15-9}{6} = \frac{6}{6}=1$

S = {1,4}