selesaikan soal di foto tersebut dengan caranya ya mengunakan rumus persaaman
Jawaban:
mis: persamaan : f(x) = ax²+bx+c
[1]
f(0) = 4
a(0)²+b(0)+c = 4
c = 4 ... [1]
[2]
f(-9) = 13
a(-9)²+b(-9)+4 = 13
81a - 9b = 9
9a - b = 1 ... [2]
[3]
f(-6) = 4
a(-6)²+b(-6)+4 = 4
36a - 6b = 0
6a = b ... [3]
[2] & [3]
9a - b = 1
9a - 6a = 1
a = ⅓
6a = b
6(⅓) = b
b = 2
persamaan : f(x) = ⅓x² + 2x + 4
[answer.2.content]
