Baca Juga: Kunci Jawaban Bahasa Inggris Kelas 9 SMP Halaman 207 If You Are a Good Person Terbaru 2022
Jawaban: -((7)2 – 4(-3/4)(-18))/(4(-3/4)) = - (49 – 54)/-3 = -5/3.
3. Sketsalah grafik fungsi berikut ini.
a. y = 2x2 + 9x.
Jawaban: y = 0 → 0 = 2x2 + 9x → 0 = x(2x + 9) → 2x + 9 = 0 → 2x = -9 → x = -9/2 = -4,5.
Titik puncak (-b/2a, b2 – 4ac/4a) → (-9/(2 x 2) , (92 – 4)/4) → (-9/4, 81/8) = (-2,25, -10,125).
b. y = 8x2 – 16x + 6.
Jawaban: y = 0 → (-b±√b2 – 4ac)/2a → (-(-16) ±√(-16)2 – 4.8.16))/2.8 → (16 ±√256 – 192)/16 → (16±√64)/16 = 16 ±8/16.