Rumus fungsi f(x) = -2x² - x + 1

daerahn fungsi -2:

f(2) = -2(-2)²- x + 1

f(2) = -2(4) - 2 + 1

f(2) = -8 - (-2) + 1

f(2) = -6 + 1

f(2) = (-5)

Daerah fungsi -1;

f(2) = -2(-1)² - x + 1

f(2) = -2(1) - (-1) + 1

f(2) = (-2) - (-1) + 1

f(2) = -1 + 1

f(2) = 0

Daerah fungsi 0:

f(0) = -2(0)² - x + 1

f(0) = -2(0) - 0 + 1

f(0) = 0 - 0 + 1

f(0) = 0 + 1

f(0) = 1

Daerah fungsi 1:

f(1) = -2(1)² - x + 1

f(1) = -2(1) - 1 + 1

f(1) = -2 - 1 + 1

f(1) = -3 + 1

f(1) = (-2)

Daerah fungsi 2:

f(2) = -2(2² - x + 1

f(2) = -2(4) - 2 + 1

f(2) = -8 - 2 + 1

f(2) = -10 + 1

f(2) = (-9)

Jadi, daerah fungsinya adalah {-5, 0, 1, -2, -9}