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all04
449.71 a
$3ab^2-3a^3=
$=3a(b^2-a^2)
449.71 b
$3a^2x-3x^3=
$=3x(a^2-x^2)
449.81 a
$4(a+b)^2-9(a-b)^2=
$=(5a-b)(5b-a)
449.81 b
$(2a+3)^2-(a-1)^2=
$=(3a+2)(a+4)
449.83 a
$(2a+1)^2-(a-1)^2=
$=3a(a+2)
449.83 b
$(3a-1)^2-(2-a)^2=
$=(2a+1)(4a-3)
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