Question

No 130 guys cara dan jawaban ya

Answer 1

Bentuk persamaan fungsi kuadrat :

f (x) = ax² + bx + c

x puncak = -b/2a
-b/2a = 2
-b = 4a
b = -4a

f (x) = ax² - 4ax + c

f (2) = -3
a(2)² - 4a(2) + c = -3
4a - 8a + c = -3
-4a + c = -3
c = 4a - 3

f (x) = ax² - 4ax + 4a - 3

f (-2) = -11

a(-2)² - 4a(-2) + 4a - 3 = -11
4a + 8a + 4a - 3 = -11
16a = -11 + 3
16a = -8
a = -8/16
a = -1/2

f (x) =ax² - 4ax + 4a - 3
f (x) = -1/2x² + 2x - 2 - 3
f (x) = -1/2x² + 2x - 5
→ C.