Question

$(Х-4)^2-х(х+16)$

Answer 1

$\(x-4)^2-x(x+16) =\ x^2-8x+16-x^2-16x=\ -24x+16$

Answer 2

$(x-4)^2-x(x+16)=x^2-2*x*4+4^2-x*x-x*16=x^2-8x+16-x^2-16x=-24x+16$