## anonymous 4 years ago identify the solutions to the equation x^2=4x-1 when you solve using the quadratic formula

1. anonymous

possibilities: |dw:1327797213692:dw|

2. myininaya

$x^2-4x+1=0$

3. myininaya

so we need to solve this equation

4. myininaya

$x=\frac{-(-4) \pm \sqrt{(-4)^2-4(1)(1)}}{2(1)}$

5. myininaya

i just plugged into the quad formula now we need to simplify

6. myininaya

$x=\frac{4 \pm \sqrt{16-4}}{2}=\frac{4 \pm \sqrt{12}}{2}$ do you think we can simply further

7. myininaya

$\sqrt{12}= \sqrt{4 \cdot 3} =\sqrt{4} \sqrt{3}=2 \sqrt{3}$ try using this

8. anonymous

so would it be b. or c. (with the i?)

9. myininaya

no i

10. myininaya

the thing under the square root was not negative it was positive

11. anonymous

thanks!!

12. myininaya

np

13. anonymous

can you help with this one too? http://openstudy.com/study#/updates/4f248607e4b0a2a9c2669423