Question

Determine as raizes reais da seguinte função
A) 2x² + x - 3 = 0

Answer 1

a= 2

b= 1

c= -3

$x = \frac{-(1) \frac{+}{-} \sqrt{1^{2} - 4 . 2 . -3} }{2 . 2}=\frac{-1 \frac{+}{-} \sqrt{1 +24} }{4}= \frac{-1 \frac{+}{-} \sqrt{25} }{4}=\frac{-1 \frac{+}{-} 5 }{4} \\\\X'=- 1 + 5 / 4\\x' = 4 /4 \\x' = 1 \\\\x'' = - 1 - 5/4\\x'' =-6 / 4\\x''= -1,5$