a. Jika f(x) = ax + b. f(1) = 5, dan f(3) = 13. Tentukan: nilai dari f(-3)!
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Penjelasan dengan langkah-langkah:
f(x) = ax + b
f(1) = 5
a(1) + b = 5
a + b = 5 ................ (1)
f(3) = 13
a(3) + b = 13
3a + b = 13 ........... (2)
eliminasi (2) dan (1)
3a + b = 13
. a + b = 5
---------------- -
2a + 0 = 8
a = 8/2
a = 4
subtitusikan nilai a = 4 ke (1)
a + b = 5
4 + b = 5
b = 5 - 4
b = 1
jadi persamaannya :
f(x) = 4x + 1
f(-3) = 4(-3) + 1
f(-3) = -12 + 1
f(-3) = -11
" maaf kalau salah "
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