Question

Diketahui f(x)=3x²-4.Jika domain fungsi tersebut -1,o,1,2,maka rangenya adalah

Answer 1

Verified answer

Kelas 8 Matematika
Bab Fungsi

f(x) = 3x² - 4

f(-1) = 3 . (-1)² - 4
f(-1) = 3 . 1 - 4
f(-1) = -1

f(0) = 3 . 0² - 4
f(0) = 3 . 0 - 4
f(0) = -4

f(1) = 3 . 1² - 4
f(1) = 3 . 1 - 4
f(1) = -1

f(2) = 3 . 2² - 4
f(2) = 3 . 4 - 4
f(2) = 8

Range = { -4, -1, 8 }

Answer 2

Diketahui:
f(x) = 3x² - 4
Domain = {-1, 0, 1, 2}

Ditanya : Range?

f(-1) = 3 (-1)² - 4
f(-1) = 3(1) - 4 = -1 

f(0) = 3(0)² - 4
f(0) = 3(0) - 4 = -4

f(1) = 3(1)² - 4
f(1) = 3(1) - 4=-1

f(2) = 3(2)² - 4
f(2) = 3(4) - 4=8

Range = { -4, -1, 8 }