Question

$x^{2} -4- x^{2} -4$  =?explicati 
$x^{2} -9-( x+1)^{2}$ =? explicati

Answer 1

x²-4-x²-4=-8
x²-9-(x+1)²=x²-9-(x²+2x+1)=x²-9-x²-2x-1=-2x-10=-x-5
(x+1)²=x²+2x+1