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To differentiate f(x) = 5x + 9 , the 9 is a constant. When you differentiate a constant, you get 0. So |dw:1436539169374:dw|
@nairz it is factor theorm right?
5x Also, what does the dash you put after the "(5x)" mean?
can we do like substituting x with 2?
the dash mean the derivative of x use the rule for algebraic differentiation y = a x^n y' = an x^(n-1)
* dash means the derivative of f(x)
can i know whether i told is right?
I don't knnow @Melodious
pls which grade maths is this?
- you substitute 2 after you have found the derivative
@Melodious most likely 11-12 grade
@welshfella that was what i was asking from the beginning
yeah @welshfella is correct :) the dash just means derivative of.
@nairz i studied in ninth grade
the same topic
Ok. Well I don't know how to find n
if we differentiate 5x, we don't get 5x :) |dw:1436539684365:dw|
n is 1 or -1?
x^0 = 1
5x^0 = 5 times x^0 = 5 times 1 = 5
so 5x^0 = ?
but if we take it's first derivative then it becomes only 5,then where to put the value of x?
i have no idea..:/
nowhere the values is 5
then what is the meaning of value at x=2?
f'(x) = 5 the graph will be a horizontal line so the values will be 5 whatever value x is
so is it 5 or 10?
it can't be 10... f ' (x) = 5 so it's just 5
so f'(2) = 5
sorry that should be f'(x) on the vertical axis:-
yaaa :) So because it is a horizontal line , at ANY value of x, f'(x) = 5 ^-^