разложите на множители : (a + 3b)^2 - b^2 - 2ab - a^2
(a + 3b)^2 - b^2 - 2ab - a^2 = (a+3b)^2 - (b+a)^2
(a+3b)^2-b^2-2ab-a^2=4b*(2b+a)
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(a + 3b)^2 - b^2 - 2ab - a^2 = (a+3b)^2 - (b+a)^2
(a+3b)^2-b^2-2ab-a^2=4b*(2b+a)