dan lewat titik (0,6) yaitu
–2x² + 4x + 6
Pembahasan:
• y = a(x – ₁)(x – x₂)
y = a(x + 1)(x – 3)
lewat (0,6)
6 = a(0 + 1)(x – 3)
6 = –3a
a = –2
• y = –2(x + 1)(x – 3)
= –2(x + 1)(x – 3)
= –2x² + 4x + 6
–2x² + 4x + 6