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a²/a - 1/a = 3
a² - 1 = 3a
a² - 3a - 1 = 0
pakai rumus a,b,c
a12 = (-b+ √b²-4ac )/2a
= (3 + √-3² - 4(1)(-1) )/ 2
= (3 + √9 +4) /2
= (3 + √13) / 2
a1 =
a2 =
masih ada kemungkinan lain soalnya :
a-1 = 3a
-1 = 3a-a
-1 = 2a
a = -1/2