ex 3
a1) x = 3 sau -3
a2) x = 8, -8
a3) x = 15, -15
a4) x = -25 , 25
b1) x+1 = 0, x = -1 (fara al doilea caz ca nu exista x+1 = -0 )
b2) x+5 = 0, x = -5
b3) 2x+1 = 0, 2x = -1, x = -1/2
b4) 3x+6 = 10, 3x = 4, x = 4/3 sau
3x+6 = -10, 3x = -16, x = -16/3
c1) x+2 = 3, x = 1
x+2 = -3, x = -5
c2) 2x-1 = 3, 2x = 2, x= 1
2x-1 = -3, 2x= -4, x = x = -2
c3) 3x+3 = 6, 3x= 3, x = 1
3x+3 = -6, 3x = -9, x = -3
c4) 8x-2 = 8, 8x = 6, x = 6/8 = 3/4
8x-2= -8, 8x = -10, x= -10/8= -5/4
ex 4
a1) x+3 = 1 , x = -2
x+3 = -1, x = -4
a2) x-4 = 2, x = 6
x-4 = -2, x = 2
a3) -2x+4 = 3, -2x = -1 , x = 1/2
-2x+4 = -3, -2x = -7, x= 7/2
b1) 5x+2 = 12, 5x = 10, x= 2
5x+2 = -12, 5x = -14, x= -14/5
b2) 7x+1 = 8, 7x = 7, x= 1
7x+1 = -8, 7x = -9, x = -9,7
b3) x+5 = 10, x= 5
x+5 = -10, x= -15
c1) x-4 = 7, x= 11
x-4 = -7, x= -3
c2) 2x+4 = 8, 2x = 4, x = 2
2x+4 = -8, 2x= -12, x= -6
c3) x-3 = 5, x= 8
x-3 = -5, x= -2
