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x = ⁵/₂
sisa 49 --> f(⁵/₂) = 49
f(⁵/₂) = 2(⁵/₂)³ + 5(⁵/₂)² - (a+2) ⁵/₂ + 4
49 = ¹²⁵/₄ + ¹²⁵/₄ - ⁵/₂ a - 5 + 4
= ²⁵⁰/₄ - ⁵/₂ a - 1
50 = ¹²⁵/₂ - ⁵/₂ a
100 = 125 - 5a
5a = 25
a = 5
suku banyak f(x) = 2x³ + 5x² - 7x + 4
dibagi 2x-1
2 5 -7 4
¹/₂ 1 3 -2
---------------------- +
2 6 -4 2
2x²+6x- 4------> sisa bagi