(a+3)•(a-3)=16
Vom inlocui parantezele cu un produs a doua numere care inmultite dau 16
16=1•16
a+3=1=>a=-2
a-3=16=>a=19
a+3=16=>a=13
a-3=1=>a=4
16=2•8
a+3=2=>a=-1
a-3=8=>a=11
a+3=8=>a=5
a-3=2=>a=5
16=4•4
a+3=4=>a=-1
a-3=4=>a=7
16=(-1)•(-16)
a+3=-1=>a=-4
a-3=-16=>a=-13
a+3=-16=>a=-19
a-3=-1=>a=2
16=(-2)•(-8)
a+3=-2=>a=-5
a-3=-8=>a=-5
a+3=-8=>a=-11
a-3=-2=>a=1
16=(-4)•(-4)
a+3=-4=>a=-7
a-3=-4=>a=-1
