Mat f(x) …………………………

Jawaban:

A. f(x) = 2x² – 3x

Penjelasan dengan langkah-langkah:

f(x) = ax² + bx

f(1) = a + b = -1

f(2) = 4a + 2b = 2

a + b = -1

4a + 2b = 2

4a + 4b = -4

4a + 2b = 2

——————– –

2b = -6

b = -6/2

b = -3

a + b = -1

a – 3 = -1

a = -1 + 3

a = 2

f(x) = ax² + bx

f(x) = 2x² – 3x