SOLUTION: The function g is defined by g(x)=x^2-2x Find g(2a) The part where I should simplify is what I do not understand. what I did is: g(2a)=(2a)^2-2(2a) g(2a)=4a

Algebra ->  Equations -> SOLUTION: The function g is defined by g(x)=x^2-2x Find g(2a) The part where I should simplify is what I do not understand. what I did is: g(2a)=(2a)^2-2(2a) g(2a)=4a      Log On


   

Question 1047329: The function g is defined by g(x)=x^2-2x Find g(2a)

The part where I should simplify is what I do not understand.
what I did is: g(2a)=(2a)^2-2(2a)
g(2a)=4a-4a
g(2a)=0

Another tutor answered my question and he said the answer was: g(2a)=4a^2-4a
He did not explain how he go the answer so I am still so very confused.
Found 3 solutions by josgarithmetic, ikleyn, advanced_Learner:
Answer by josgarithmetic(39616) About Me  (Show Source):
You can put this solution on YOUR website!
The part where I should simplify is what I do not understand.
what I did is: g(2a)=(2a)^2-2(2a)

g%282a%29=%282a%29%5E2-2%282a%29
%282a%29%282a%29-2%282a%29
2%2Aa%2A2%2Aa-2%2A2a
2%2A2%2Aa%2Aa-2%2A2a
4a%5E2-4a

Answer by ikleyn(52776) About Me  (Show Source):
You can put this solution on YOUR website!
.
The function g is defined by g(x)=x^2-2x Find g(2a)
~~~~~~~~~~~~~~~~~~~~~~` 

g(2a) = (2a)^2 - 2*(2a) = 4a^2 - 4a.


Answer by advanced_Learner(501) About Me  (Show Source):
You can put this solution on YOUR website!
g%282a%29=%282a%29%5E2-2%282a%29
g%282a%29=%284a%5E2%29-2%282a%29 notice the square
g%282a%29=%28%284a%5E2%29-4a%29
g%282a%29=%28%284a%28a-1%29%29%29