Question

Determine os valores reais de x que tornam a função positiva,negativa ou nula
A)y= 2x - 6 B)y= -8 + x C)y= -x + 11 D)y= -2x - 4
Me ajudem pfv ❤

Answer 1

a) 2x-6= 0
2x = 6
x = 3

2x - 6 > 0
2x > 6
x > 3

2x - 6 < 0
2x < 6
x < 3

b) -8 + x = 0
x = 8

x - 8 > 0
x > 8

x - 8 < 0
x < 8

c) -x+11= 0
x= 11

-x+11 > 0
x < 11

-x +11<0
x>11

d) -2x-4=0
-2x= 4
x = -2

-2x -4>0
-2x>4
x<-2

-2x-4<0
-2x<4
2x > -4
x > -2