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If f(x)=3x+1 then f(a+h)-f(a)
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If f(x)=3x+1 then f(a+h)-f(a)

User Briantuju
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1 Answer

2 votes
f(x) = 3x+1
put x = a+h
f(a+h) = 3(a+h) + 1
f(a+h) = 3a + 3h + 1
put x = a
f(a) = 3a + 1
f(a+h)-f(a) = 3a + 3h + 1 -(3a+1)
f(a+h)-f(a) = 3a +3h + 1 - 3a -1
f(a+h)-f(a) = 3h
User Earon
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