9(a-b)(3a+b)²+25(a+3b)²(b-a)

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9(a-b)(3a+b)²+25(a+3b)²(b-a)
9(a-b)(3a+b)²+25(a+3b)²(b-a)

9(a-b)(3a+b)²+25(a+3b)²(b-a)
9(a-b)(3a+b)²+25(a+3b)²(b-a)
=(a-b)(3a+b)²(9-25)
=-16(a-b)(3a+b)²