## BMI229 2 years ago (x – 3)2 = 2

1. Hope_nicole

distribute the 2 so it would be|dw:1366645202678:dw|

2. Hope_nicole

or are you saying its ^2 not 2

3. BMI229

|dw:1366645220762:dw| ^2 <-

4. Hope_nicole

ahh, well that just means that you are doing (x-3)(x-3)=2

5. BMI229

I got this x = 3 ± sqrt 2

6. BMI229

:) or :(

7. Hope_nicole

how did you get that? im not knocking whether it is right or wrong i just wanna know how you did it

8. BMI229

x2^-6x+9=2 x=3+-sqrt2

9. BMI229

new problem now?

10. BMI229

Sam’s plasma TV has a 14 in by 18 in screen with a plastic trim border. The total area of the TV and border is 480 in2. How wide is the trim around the TV?

11. Hope_nicole

good.

12. Hope_nicole

13. BMI229

w = width of border (14 + w)(18 + w) = 480 252 + 32w + w^2 = 480 w^2 + 32w - 228 = 0 ( w + 38)(w - 6) = 0 so w = -38 (impossible) or w = 6 6 in

14. Hope_nicole

there you go :)

15. BMI229

Part 1: Solve the following equation using one of the methods listed below. Show all work. (4 points) Part 2: Using complete sentences, explain why you chose the method you used. (2 points) Equation: 0 = x2 + 6x + 3

16. Hope_nicole

okay, how would you solve it?

17. BMI229

x²+6x+3=0 x² +6x +9 +3 =9 (Add the square of 1/2 the coefficient of x to both sides.) x²+6x +9 = 6 (Simplify) (x+3)²=6 (Write the trinomial as a perfect square. x+3 = ±√6 (Take the square root of both sides.) x=-3 ±√6 (Simplify) I choose completing the square because it requires less arithmetic than the other common method of using the quadratic formula. Graphing would not produce an accurate answer and since it cannot be factored into whole numbers, that method is not desirable.

18. Hope_nicole

haha you get this stuff :) why are you asking for help

19. BMI229

just some were difficult thats all

20. Hope_nicole

ahh well you seem to me you are gonna get an A :D