## kenneyfamily 2 years ago what number would complete the square? x^2-2x+6=0

1. kenneyfamily

a)1 b)6 c)4 d)-1

2. 03453660

1

3. kenneyfamily

you sure?

4. kenneyfamily

@03453660

5. 03453660

yap

6. 03453660

want to know??

7. kenneyfamily

sure

8. kenneyfamily

@03453660

9. 03453660

ok

10. 03453660

your equation is x^2-2x+6=0 now take the constant to RHS x^2-2x = -6 look to LHS of this equation what should i add to make it perfect square like it become (a+b)^2 or (a-b)^2

11. kenneyfamily

ok

12. 03453660

so if i add 1 to LHS and RHS then LHS become a perfect square x^2-2x+1 = -6+1 (x-1)^2 = -5 this LHS has became a perfect square by adding 1 to it

13. kenneyfamily

got it!! thanks!!

14. 03453660

welcome! and sorry for the late reply i have some problem in internet connection

15. kenneyfamily

no worries..could you help me with one more please? x^2-4x-9=0 @03453660

16. kenneyfamily

a)9 b)-4 c)4 d)13

17. 03453660

this is 4

18. 03453660

did you know how to solve this. its a little bit tricky

19. kenneyfamily

ok i can try and figure it out! thank you :)

20. 03453660

you are wlcome