Răspuns :
a)[tex] x^{2} [/tex]+4x+4=0 -ecuatie de gradul 2
Δ=[tex] b^{2} [/tex]-4ac=[tex] 4^{2} [/tex]-4+4=0 =>x1=x2
x1,2=(-b+-radical din Δ)/2a=(-4+-0)/2=-2
Δ=[tex] b^{2} [/tex]-4ac=[tex] 4^{2} [/tex]-4+4=0 =>x1=x2
x1,2=(-b+-radical din Δ)/2a=(-4+-0)/2=-2
a)x patrat +4x+4=(x+2) totul la patrat
b)4x(x+1)+1
c)x patrat+2x+3x+6=
x(x+2) + 3(x+2)
=(x+2)(x+3)
d)x patrat-7x-8x+56
=x(x-7)-8(x-7)
(x-8)(x-7)
b)4x(x+1)+1
c)x patrat+2x+3x+6=
x(x+2) + 3(x+2)
=(x+2)(x+3)
d)x patrat-7x-8x+56
=x(x-7)-8(x-7)
(x-8)(x-7)