Posted by **Hope** on Wednesday, June 3, 2009 at 8:08pm.

Use the quadratic formula to solve the equation. Give exact answers:

2x^2 -1 = 6x.

The choices are:

a) -3 + square root(7)/2, -3 - square root(7)/2

b) 3 + square root(11)/2, 3 - square root(11)/2

c) 3 + square root(7)/2, 3 - square root(7)/2

d) -3 + square root(11)/2, -3 - square root(11)/2

I attempted this problem but got none of these answers! Could you please walk me through the problem and tell me which answer is correct? Thank you so much! :)

- Algebra -
**Damon**, Wednesday, June 3, 2009 at 8:19pm
2 x^2 - 6 x - 1 = 0

x = [ 6 +/- sqrt (36 + 8) ] / 4

x = [ 6 + /- sqrt (44) ] / 4

x = [ 6 + /- 2 sqrt (11) ] / 4

x = [ 3 +/- sqrt(11) ] / 2 so b

- Algebra -
**Billy**, Wednesday, May 9, 2012 at 6:39pm
4ã7+3ã3

- Algebra -
**kulani**, Sunday, March 15, 2015 at 10:15am
2x^2-1=6x

2x^2-6x-1=0

a b c and then solve by using the quadratic formula

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