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Subtitusikan aja semua domainnya ke 'x'
f(-1) = 2(-1)² - (-1)+1
f(-1) = 2(1) + 1 + 1
f(-1) = 2 + 2
f(-1) = 4
f(0) = 2(0)² -(0) + 1
f(0) = 2(0) - 0 + 1
f(0) = 0 - 0 + 1
f(0) = 1
f(1) = 2(1) ² - (1) + 1
f(1) = 2(1) - 1 + 1
f(1)= 2 - 1+1
f(1) = 2
Rangenya = {1,2,4}
Kalau salah maaf
f(0) = 2(0)^2 -(0)+1 = 1
f(1) = 2(1)^2 -(1)+1 = 2
Range = {4,1,2}