Question

（x平方减5)的平方减8倍（5减X平方）+16

Answer 1

（x^2-5)^2-8(5-x^2)+16

=（x^2-5)^2+8(-5+x^2)+16

=(x^2-5+4)^2

=(x^2-1)^2

=(x+1)^2(x-1)^2