Question

resolva as inequações a. 4x+8>10 b. 7-3x < -14 c. 16+8x >0 d.2x-1 5-5x > 0 e.(x+3) (x+2)<0

Answer 1

a)
4x+8>10
4x>10-8
4x>2
x>2/4
x>1/2

b)
7-3x < -14
-3x < -14 -7
-3x < -21 ×(-1)
3x> 21
x>21/7
x>3

c)
16+8x>0
8x>-16
x>-16/8
x>-2

d)
2x-15-5x>0
-3x>15 ×(-1)
3x<-15
x < -15/3
x <-5

e)
x²+ 2x + 3x + 6<0
x²+ 5x + 6<0

(-5±√(5²-4*1*6))/2*1
(-5±√1)/2

x'<-2
x"<-3