Question

Rezolvati in Z ecuatiile: c) |2x-3|=7; f) | -2x+4|=0; i) |-2x+6|=1. Va rog ajutatima.

Answer 1

|2x-3|=7

X={-x

+x

1. 2x-3=+7/+3

2x=10/:2

X=5

2x-3=-7/+3

2x=-4/:2

X=-2

S={5; -2}

F) |-2x+4|=0

-2x+4=0/-4

-2x=-4/: (-2)

×=2

-2x+4=-0/-4

-2x=-4/:(-2)

-×=+2

X=-2

S={-2; 2}

G)|-2x+6|=1

-2x+6=1/-6

-2x=-5/:(-2)

-×=+5supra 2

+×=-5supra 2

S={+5 supra 2; -5 supra 2}