please help me with this equation.. im totally stuck
if f(x) = 10 + 2x then f (5) equals?
the answer and working out will also be appreciated
so i will know how to do it for the rest of them
thank you so much
keep rocking
if f(x) = 10 + 2x then f (5) equals?
2009-05-23 7:35 am
回答 (7)
2009-05-23 7:41 am
✔ 最佳答案
Just substitute x:f(5) = 10 + 2(5)
f(5) = 10 + 10
f(5) = 20.
2009-05-23 7:43 am
the answer is 20...it is because f(x)..represents the x in the (10+2(x)...so the x is = 5 then...substitute...so (10+2(5))...= 20....
f(5) = 10 + 2(5)
f(5) = 10 + 10
f(5) = 20
f(5) = 10 + 2(5)
f(5) = 10 + 10
f(5) = 20
參考: ...my highschool
2009-05-23 12:15 pm
f ( 5 ) = 10 + 10
f ( 5 ) = 20
f ( 5 ) = 20
2009-05-23 7:56 am
f(x) = 10 + 2x
f(5) = 10 + 2(5)
f(5) = 10 + 10
f(5) = 20
f(5) = 10 + 2(5)
f(5) = 10 + 10
f(5) = 20
2009-05-23 7:45 am
f(x) = 10 + 2x (given)
So, f (5) = 10 + 2*5 = 10+ 10 = 20.
So, f (5) = 10 + 2*5 = 10+ 10 = 20.
2009-05-23 7:44 am
f(5)=10+2(5)
=20
working out:
replace x in the right hand side of the equation with the value it has been replaced with in the left hand side... like here in the left handside x is replaced by 5 in f(x) so replace x by 5 in the main equation. it is the value of f(x) when x=5.
=20
working out:
replace x in the right hand side of the equation with the value it has been replaced with in the left hand side... like here in the left handside x is replaced by 5 in f(x) so replace x by 5 in the main equation. it is the value of f(x) when x=5.
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https://hk.answers.yahoo.com/question/index?qid=20090522233554AAViP4z