Răspuns :
(x+2)(x-3)+3x+7= x^2 - x - 6 +3x + 7 = x^2 + 2x + 1 = (x+1) ^2
Deci a = (x+1)^2
:)
(x+2)(x-3)+3x+7=
=x*x-3x+2x-6+3x+7=
=x*x+2x+1=
=(x+1)la patrat
deci este patrat perfect
=x*x-3x+2x-6+3x+7=
=x*x+2x+1=
=(x+1)la patrat
deci este patrat perfect