urgens !!!!!!! aide moi

E=16-(5x-3)²
1)  X=-1
E=16-(5(-1) -3)²=16-25-9=0
E=0
2) E=16-(5x-3)²
=16-(5x-3)(5x-3)
16-25x²+15x+15x+9
=16-25x²+30x +9
=25x²+30x+7
   
3)E=25x²+30x+7
5x(5x+6)+7