Răspuns :
(x-4)²-x²+8x
(Folosim formula (a-b)²=a²-2•a•b+b²)
=(x²-2•x•4+4²)-x²+8x
=x²-8x+16-x²+8x
(X² si -x² ; -8x si 8x se simplifica ,fiind opuse)
=16
Succes!
(Folosim formula (a-b)²=a²-2•a•b+b²)
=(x²-2•x•4+4²)-x²+8x
=x²-8x+16-x²+8x
(X² si -x² ; -8x si 8x se simplifica ,fiind opuse)
=16
Succes!