Question

rezolvati ecuatiile:
a)5x-2=-7
b)4-2,3x=-0,6
c)√2 + 2x=√18


repedeee !!!!

Answer 1

a) 5x= -7+2
x= 5supra 5 = 1
b) -2.3 x= -0,6-4
-2,3x=-4,6 (inmultesti cu -1)
x= 4,6 supra 2,3
x=2 
c) rad din 18=3 rad 2
2x=3rad2-rad 2 
2x=2rad2 
x=rad2

Answer 2

a)  5x = -7 + 2  => 5x = -5 => x= -5 : 5 = -1
b) 4- 2,3x= 0,6 => 4- 23x/10 = 6/10 => 4-23x/10= 3/5 => -23x/10= 3/5 -4 =>
-23x/10 = 3/5 - 20 / 5 => -23x/10 = -17/5 => -23x/10 = -34/10 => -23x = 34 => x = 34/-23
c) √2 + 2x = √18 =>  2x= √18 - √2  => 2x= 3√2 - √2 => 2x= 2√2 => x = 2V2/2 => x = √2