Question

Se x= -2,1, Qual é o valor de 0,25-x²/0,5+x?

Answer 1

0,25 - (-2,1)²/0,5x
0,25 + 4,41/0,5x
x= 4,66/0,5
x= 9,32

Answer 2

$x= -2,1$
Então
$y= \frac{0,25-x^2}{0,5+x}\\\\ y=\frac{0,25-(2,1^2)}{0,5+(2,1)}\\\\ y=\frac{0,25-4,41}{0,5+2,1}\\\\ y=\frac{-4,16}{2,6}\\\\ y=-1,6$