(a-4b)alla seconda+(a-6b)(a+6b)-4b(-5b-2a)=
627)
$(a-4b)^2+(a-6b)(a+6b)-4b(-5b-2a)$ =
= $a^2-8ab+16b^2+a^2-36b^2+20b^2+8ab$ =
= $2a^2$
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