## anonymous one year ago Solve x2 + 6x + 7 = 0. a) x = −1 and x = −5 b) 3 plus or minus square root of 2 c)-3 plus or minus square root of 2 d)-3 plus or minus square root of 2 all over 2

1. anonymous

is that x^2 ?

2. anonymous

yes

3. anonymous

use the quadratic formula $\frac{ -b \pm \sqrt{b ^{2}-4ac} }{ 2a }$ A= 1 B = 6 C= 7

4. anonymous

err C

5. anonymous

ya it's -6/2 = -3 and sqrt(8) / 2 = sqrt(2)

6. anonymous

so -3 plus minus sqrt 2

7. anonymous

thank you

8. anonymous

you were right, you just didn't apply the /2

9. anonymous

Np.

10. anonymous

how would i do −16t2 + 64t + 4?

11. anonymous

would it be 2 plus or minus square root of 17 all over 2?

12. anonymous

sorry just saw this

13. anonymous

$2 \pm \frac{ \sqrt{17} }{ 2 }$

14. anonymous

since it's 64/32 = 2 it becomes only sqrt(17)/2

15. anonymous

thank you so much

16. anonymous

Np