Răspuns :
a)9x^2+24x+16
b)x^2-6x+9
c)25-x^2
d)x^2-4y^2+9z^2-4xy-12yz+6xz
e)36x^2-12x+1-9x^2+9+3(4x^2-28x+49)
=36x^2-12x+1-9x^2+9+12x^2-84x+147
=39x^2-96x+157
b)x^2-6x+9
c)25-x^2
d)x^2-4y^2+9z^2-4xy-12yz+6xz
e)36x^2-12x+1-9x^2+9+3(4x^2-28x+49)
=36x^2-12x+1-9x^2+9+12x^2-84x+147
=39x^2-96x+157