Square of Difference: Identify the greater value

Fill in the corresponding sign given that

x > 0

$(x-4)^2?x^2+16$

<

Fill in the corresponding sign

$(\sqrt{40}-\sqrt{10})^2?30$

<

Fill in the corresponding sign

$3-2\sqrt{3}a+a^2?(\sqrt{3}-a)^2$

$=$

Since 0 < a Fill in the correct sign

$(a-\sqrt{20})^2?a(a+20)+20$

<

Since 0 < b

Fill in the corresponding sign

$(3b-4)(3b-4)?9b(b+\frac{1}{b})+7$

<

0 < a,b

Fill in the corresponding sign

$a(a-b)^2?a(a+b)^2-ab^2$

< When a>\frac{b}{4}