when x=5,x2-2x+7, for x=5

Question

when x=5,x2-2x+7, for x=5

Answer 1

OK, I think the problem is to evaluate x² - 2x + 7 for x=5.  Since x=5, all you have to do is replace each x with a 5:

 

x² - 2x + 7

 

5² - (2*5) + 7

 

Can you finish it from here?

Answer 2

Each place you have an x substitute in a 5. 

 

(5)^2 -2(5) +7

 

25 -10 +7

 

15 + 7

 

23