Question

Rezolvă ecuațiile: a)3x-14=0
b)7x+6x=39
c)5x-7=3,x∈{-2,0,2,5}
d)6(x+3)=2x-15
e)x(9+25)=-3²-5²
f)4x-13=0,x∈{-13_4,0,4_13,2}
dau coronita

Answer 1

a)3x=0+14
3x=14
x=14:3
x=14 supra 3
b)7x+6x=39
13x=39
x=39:13
x=3
c)5x-7=3,x∈{-2,0,2,5}
5x=3+7
5x=10
x=10:5
x=2 x ∈{-2,0,2}
d)6(x+3)=2x-15
6 ori x +6ori3=2x-15
6x+18=2x-15
6x-2x=+15-18
4x=-3
x=-3:-4
x=3 supra 4
e)x(9+25)=-3²-5²
xori9+xori25=-9-25
9x+25x=-34
34x=-34
x=-34+34
x=0
f)4x-13=0
4x=0+13
4x=13
x=13:4
x= 13supra4 x∈{-13_4,0,4_13,2}