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fungsi × didefinisikan dengan rumus f (×) = ax + b. Nilai f (2) = -7 dan f(-5) =7 nilai f(4) adalah...![]()
fungsi × didefinisikan dengan rumus f (×) = ax + b. Nilai f (2) = -7 dan f(-5) =7 nilai f(4) adalah...
f(x) = ax + b
f(2) = 2a + b = -7
f(-5) = -5a + b = 7
·
- nilai a
2a + b = -7
-5a + b = 7
__________-
-7a = -14
a = 2
- nilai b
2a + b = -7
2(2) + b = -7
4 + b = -7
b = -7 - 4
b = -11
- nilai f(4)
f(x) = 2x - 11
f(4) = 2(4) - 11
f(4) = 8 - 11
f(4) = -3
AF࿐
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