TXMary2 Posted March 9, 2013 Posted March 9, 2013 (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 Quote
Dana Posted March 9, 2013 Posted March 9, 2013 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 Quote
TXMary2 Posted March 9, 2013 Author Posted March 9, 2013 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. Quote
Dana Posted March 9, 2013 Posted March 9, 2013 3x -6 is simplified. A polynomial is simplified if it doesn't have parentheses and like terms are combined. Quote
TXMary2 Posted March 9, 2013 Author Posted March 9, 2013 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. Quote
Dana Posted March 10, 2013 Posted March 10, 2013 You can't solve for x unless you've got an equation. :) Quote
TXMary2 Posted March 10, 2013 Author Posted March 10, 2013 You can't solve for x unless you've got an equation. :) You underestimate me - I could solve that for x. Obviously it is -2 :001_tt2: Quote
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