Nilai a + b = ….
Jawaban:
F(x) = (2x³ + ax² – bx + 3) dibagi oleh (x² – 4) sisa (x + 23)
F(2) ➙ 2(2)³ + a(2)² – 2b + 3 = 2 + 23
16 + 4a – 2b + 3 = 25
F(-2) ➙ 2(-2)³ + a(-2)² + 2b + 3 = -2 + 23
-16 + 4a + 2b + 3 = 21
(1) 16 + 4a – 2b + 3 = 25
(2) -16 + 4a + 2b + 3 = 21 _
32 – 4b = 6
b = -28 = 7
-4
(1) 16 + 4a – 2(7) + 3 = 25
a = 20 = 5
4
Kaprikornus, a + b = 5 + 7 = 12