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a-2b+a-b+a+a+b+a+2b = 35
5a = 35
a = 7
Sehingga:
(a-2b)(a-b)a(a+b)(a+2b) = 3640
(7-2b)(7-b)7(7+b)(7+2b) = 3640
7(49-21b+2b²)(49+21b+2b²) = 3640
(2b²+49+21b)(2b²+49-21b) = 520
(2b²+49)² - (21b)² = 520
4b⁴+196b²+2401-441b² = 520
4b⁴-245b²+2401-520 = 0
4b⁴-245b²+1881 = 0
(b²-9)(4b²-209) = 0
(b+3)(b-3)(2b+√209)(2b-√209) = 0
b = 3
b = -3
b = -1/2 √209
b = 1/2 √209
Maka secara sederhana, ambil b = 3
Didapat bilangan:
7-6, 7-3, 7, 7+3, 7+6
1, 4, 7, 10, 13
Atau bilangan lainnya, ambil b = 1/2 √209
Didapat bilangan: