Question

5. Resolva as inequações

 

a) x-5>0

 

b) 2x-8$<var>2x-8\geq0</var>$

 

c)3x+7>0

 

d) -x+3>0

Answer 1

 

a) x-5>0    x > 5

 

b) 2x-8   2x  >= 8  ==> x >= 8/2 ==> x >= 4

 

c)3x+7>0  => 3x > 7 ==> x > 7/3

 

d) -x+3>0  - x > - 3(-1)  => x < 3

Answer 2

a) x-5>0

     x>5


b) 2x-8
$<var>2x-8 \geq0 \rightarrow2x \geq8 \rightarrow x\geq4</var>$


c)3x+7>0

3x>-7

x>-7/3

d) -x+3>0

-x>-3

x<-3