Question

Jawab soal no.3 dan no.4 , mohon bantuannya , besok dikumpul :)

Answer 1

3. Diket :
    p(x) = 2x⁴ + 3x³ + nx - 7
    p(-3) = 98
    Ditanyakan : 
    Nilai dari p(2)
    Jawab :
    p(-3) = 98
    2(-3)⁴ + 3(-3)³ + n(-3) - 7 = 98 → 162 - 81 -3n - 7 = 98
    81 - 3n = 98 + 7 → -3n = 24 → n = -8
    p(x) = 2x⁴ + 3x³ - 8x - 7 
    p(2) = 2 (2)⁴ + 3(2)³ - 8(2) - 7 → p(2) = 32 + 24 - 16 - 7
    p(2) = 33 (b)

4. Diket : 
    f(x) = x² - x + 4
    g(x) = 3x² - 2x + c
    f(-3) = g(-3)
    Ditanyakan : 
    Hasil dari g(4)
    Jawab :
    f(-3) = g(-3)
    (-3)² - (-3) + 4 = 3(-3)² - 2(-3) + c
    9 + 3 + 4 = 27 + 6 + c
    16 = 33 + c
     c = -17
    g(x) = 3x² - 2x - 17
    g(4) = 3(4)² - 2(4) -17 → g(4) = 48 - 8 - 17
    g(4) = 23 (e)


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