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Bab FungsiMatematika SMP Kelas VIII
a] rumus fungsi adalah f(x) = 3x² - 4x + 7
b] f(4) = 3 . 4² - 4 . 4 + 7
= 3 . 16 - 16 + 7
= 48 - 16 + 7
= 39
c] x = 0
f(0) = 3 . 0² - 4 . 0 + 7
= 0 - 0 + 7
= 7
d] f(-4) = 3 . (-4)² - 4 . (-4) + 7
= 48 + 16 + 7
= 71
e] f(3t) = 3 . (3t)² - 4 . 3t + 7
= 3 . 9t² - 12t + 7
= 27t² - 12t + 7