Răspuns :
x(x+4)=252
x²+4x-252=0
(x-14)(x-18)=0
a=1 b=4 c=-252
x =[ -b+√(b²-4ac)]/2a = [-4+√(16-4x252)]/2=(-4+32)/2=14
x+4=14+4=18
P=(14+18)x2=64 m
sau
252 =2x2x3x3x7 si sa-l scrii ca 252=14x18
x²+4x-252=0
(x-14)(x-18)=0
a=1 b=4 c=-252
x =[ -b+√(b²-4ac)]/2a = [-4+√(16-4x252)]/2=(-4+32)/2=14
x+4=14+4=18
P=(14+18)x2=64 m
sau
252 =2x2x3x3x7 si sa-l scrii ca 252=14x18