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Posted

(f)(x)= 3x +2

 

f(x) - f(2)

 

I get 3x-6 and my son gets 3x-2

 

I know mine is right, but we are having a disagreement as to why. Can someone else explain how we arrive at 3x -6

 

I did:

 

3(2)+2 = 8

 

3x + 2 -8

 

3x -6

Posted

f(x) -f(2)

(3x+2) - (3*2+2). I would write it as one expression using parentheses...not as separate ones.

Now just simplify....

3x+2-8

3x-6

Posted

f(x) -f(2)

(3x+2) - (3*2+2). I would write it as one expression using parentheses...not as separate ones.

Now just simplify....

3x+2-8

3x-6

 

They don't want it simplified. The answer is 3x-6. DS is insisting it is 3x-2 because when he is doing the math he is doing

-3(2). The parentheses will show him where he went wrong. Thanks.

Posted

3x -6 is simplified.

A polynomial is simplified if it doesn't have parentheses and like terms are combined.

 

Ha! That's why I farm out Algebra! I read your post too fast and thought you meant solve for x.

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