Jawabanmu

2014-05-21T23:29:33+07:00
Y' = 2ax + b
y'(1) = 2a + b = 10
y'(3) = 6a + b = 18
---Eleminasi---
-4a=-8
a= 2
2.2 + b = 10
b = 6

a-b = 2-6 = -4
Jawaban paling cerdas!
2014-05-21T23:30:32+07:00
Y = ax²+bx+15
m = 2ax + b
10 = 2a + b
18 = 6a + b -
 -8 = -4a
a = -8/-4 = 2
2a + b = 10 ⇔ 4 + b = 10 maka b =6
a - b = 2 - 6 = -4
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