Question

(x^2-3)(x^2-3x+4)+4 este patrat perfect

Answer 1

$fie: x^{2} -3=y \\ y(y+4)+4= y^{2}+4y+4=(y+2)^2$
revenim la substitutie
$( x^{2} -3+2)^2=( x^{2} -1)^2$-patrat perfect