Square of sum: Identify the greater value

Replace '?' with the missing sign given that 0 < x :

$x(2x+3)?2(x+3)^2$

<

$(2b+5)^2?4b^2+25$

Depends on the value of b

$8a^2+2\sqrt{8}a+1?(\sqrt{8}a+1)^2$

$=$

Replace ? with the missing sign given that $m^3+2m^2n=4m^2+n^2$:

$m(m+n)^2?(2m+n)^2$

It is not possible to calculate.

Replace '?' with the missing symbol given that 0 < x < 1 :

$1+(5+x)^2+3x_{\text{ }}^2?5x^2+10x+25$

>

0 < a,b

Fill in the corresponding sign

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

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