jika f(x) = ax + b,f(1) = -4, dan f(-1) = -10, maka nilai f(2) adalah.... a. -13 b. -1 c.1 d.13
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Jawaban:
opsi b. (-1)
Penjelasan dengan langkah-langkah:
- f(x) = ax + b
jika:
f(1) → -4
f(-1) → -10
- maka:
- menentukan nilai a dan b.
1a + b = -4
-1a + b = -10 (-)
2a = 6
a = 6/2
a = 3
-1a + b = -10
-1(3) + b = -10
b = -10 - (-3)
b = -7
- nilai f(2)
f(x) = ax + b
f(x) = 3x + (-7)
f(2) = 3(2) + (-7)
f(2) = 6 + (-7)
f(2) = -1
b. (-1).
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