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x² - (penjumlahan akar)x + (perkalaian akar) = 0
x1 + x2 = - b/a = 4
x1 . x2 = c/a = 6
penjumlahan akar :
(2x1 - 1) + (2x2 - 1) = 2(x1 + x2) - 2
= 2(4) - 2
= 6
perkalian akar :
(2x1 - 1)(2x2 - 1) = 4.x1.x2 - 2x1 - 2x2 + 1
= 4(6) - 2(x1 + x2) + 1
= 24 - 2(4) + 1
= 24 - 8+ 1
= 17
persamaan kuadrat adalah
x² - (6) x + 17 = 0
x² - 6x + 17 = 0