# SOLUTION: I'm a bit confused with these problems. I get it somewhat, but for some reason I get lost after the first few variables. Evaluate function for the value specified. f(x)=x2-7x+

Algebra ->  Algebra  -> Graphs -> SOLUTION: I'm a bit confused with these problems. I get it somewhat, but for some reason I get lost after the first few variables. Evaluate function for the value specified. f(x)=x2-7x+      Log On

 Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations! Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

 Algebra: Graphs, graphing equations and inequalities Solvers Lessons Answers archive Quiz In Depth

 Question 83140: I'm a bit confused with these problems. I get it somewhat, but for some reason I get lost after the first few variables. Evaluate function for the value specified. f(x)=x2-7x+10; find (a)f(0), (b)f(5), and (c)f(-2) Rewrite equation as a function of x -3x+4y= 11 ( what i don't understand is how i find out how to rewrite this equation.) this has to be graphed- f(x)=-2x-5 ( does this get graphed like any other equation, i noticed the function notation and got a little confused) If f(x) =4x-3 then what does this equate to? f(-1)Answer by bucky(2189)   (Show Source): You can put this solution on YOUR website!******************** Evaluate function for the value specified. . find . (a) f(0) . Just substitute 0 for every x in the equation and reduce as necessary . (b) f(5) . Substitute 5 for every x in the equation: . . (c) f(-2) . Substitute -2 for every x in the equation: . . ************************** . Rewrite equation as a function of x . This problem is just asking you to solve for y. Then replace the y by "f(x)". First, solve for y. Start by getting the term containing y on one side and everything else on the other side. So get rid of the -3x on the left side by adding +3x to both sides. This makes the equation become: . . Then solve for y by dividing all terms on both sides of this equation by 4 (which is the multiplier of y) to get: . . Now just replace y by f(x) and the answer becomes: . . ***************************** . This has to be graphed- f(x)=-2x-5 . (Does this get graphed like any other equation? I noticed the function notation and got a little confused) . I'm going to assume that the "-" sign after the word "graphed" is not associated with the function. If it is, just make the appropriate changes. (The changes would involve having -y on the left side of the equation and then changing it to +y by multiplying the entire equation ... all terms on both sides ... by -1.) All you have to do for this problem is replace f(x) by y. This makes the equation to be graphed: . . Now just proceed as you would with any graphing problem. You can assign values to x and find the corresponding values of y. Then plot each x,y point for the various values of x. You are creating the graph of f(x). . When you get done the graph should look somewhat like: . . ******************* . If then what does this equate to? . f(-1) . Just as we did above, substitute -1 for every x in the equation and you get: . . So is equal to . . ******************************* . Hope this helps a little to clarify things for you regarding functional notation and what it means.