Question

Rezolvați ecuația in Z
a) 2x+5=-8
b)-3x+2=4x+9
c)x+3>6
d)x+10<-3

Vă rog ajutati-mă dau coronita si 90puncte

Answer 1

a)2x+5=-8

2x+5-5=-8-5

2x=-8-5

2x=-(8+5)

2x=-13

2x:2=-13:2

x=-13:2

$x = - \frac{13}{2}$

x=-6,5

b)-3x+2=4x+9

-3x-4x+2=4x-4x+9

-3x-4x+2=9

-3x-4x+2-2=9-2

-3x-4x=9-2

(-3-4)x=9-2

-7x=7

-7x:(-7)=7:(-7)

x=7:(-7)

x=-7:7

x=-1

c)x+3>6

x+3-3>6-3

x>6-3

x>3

x € (3,+∞)

d)x+10<-3

x+10-10<-3-10

x<-3-10

x<-(3+10)

x<-13

x € (-∞,-13)

Answer 2

a)2X+5=-8

2X=-8-5

X=-13:2

X=-6.5

b)-3X+2=4x+9

-3X-4X+2=4X-4X+9

-3X-4X+2=9

-3X-4X+2-2=9-2

-3X-4X=9-2

-7X=7

X=-7:7

X=-1

c)X+3>6

X>6-3

X>3

X€{3,4,5,6,.....}

d)X+10<-3

X<-3-10

X<-13

X€{-13,-12,......}