Question

Oricare ar fi x € Z , numarul a=(x²-3x)(x²-3x+8)+16 reprezinta patratul numarului: A.x²-2x-4 B.x²+2x-2 C.x²-3x+3 D.x²-3x+4 ???​

Answer 1

a=(x²-3x)(x²-3x+8)+16

notam y= x²-3x

=> a=y(y+8)+16

a=y²+8y+16

a=(y+4) ²

=> a=(x²-3x+4)²     D)