Question

Va implor exercitiul 3

Answer 1

a) (x-3)²

b) (5x+1)²

c) 4(x²-2x+1)-(4x-4)+1=4x²-8x+4-4x+4+1=4x²-12x+9

d) x²-6x+2(x-3)(y+1)+y²+2y+10=

x²-6x+2(xy+x-3y-3)+y²+2y+10=

x²-6x+2xy+2x-6y-6+y²+2y+10=

x²-4x-4y+y²+2xy+4= x²+y²+2xy-4x-4y-4=(x+y)²-4(x+y+1)

e) a⁴+2a²+ 1= (a²+1)