Question

F(x) = ax² + bx
jikaf(1) = 1 dan f(3) = 0
tentukan bentuk fungsi f(-5) !

Answer 1

F(x) = ax^2 + bx

f(3) = 0
9a + 3b = 0
3b = -9a
b = -3a

f(1) = 1
a + b = 1
a - 3a = 1
-2a = 1
a = -1/2

a + b = 1
-1/2 + b = 1
b = 3/2

f(-5) = -1/2 x^2 + 3/2 x
f(-5) = -25/2 - 15/2
f(-5) = -40/2
f(-5) = -20