# Algebra

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! :)

1. 👍 0
2. 👎 0
3. 👁 1,030
1. 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

1. 👍 0
2. 👎 0
2. 4�ã7+3�ã3

1. 👍 0
2. 👎 0
3. 2x^2-1=6x
2x^2-6x-1=0
a b c and then solve by using the quadratic formula

1. 👍 0
2. 👎 0

## Similar Questions

2. ### math

Use the quadratic formula to solve the equation -x^2 + 7x = 8

3. ### Algebra

What method(s) would you choose to solve the equation? Explain your reasoning. 4x^2-48=0 a. Quadratic formula, graphing; the equation cannot be factored easily since the numbers are large. Selected:b. Square roots; there is no

4. ### algebra

Solve this quadratic equation using the quadratic formula. x^2 + 8x - 5 = 0

1. ### Algebra

Solve the quadratic equation. 3x^2-15x+18=0 I know that the formula to quadratic equation is x=-b+and-(square root)b^2-4ac divided by 2a. I know that a=3, b=-15 and c=18, then subsitute in and get two answers, my problem is that I

can you solve the equation using the quadratic formula x2 + 3x = 7? Explain and provide an exact answer.

3. ### math

solve the following by a quadratic equation and then solving it. a rocket is projected vertically upwards from ground level, its height "h" meters after "t" seconds is given by the formula h=35t-5t^2 how long does it take to reach

4. ### math help

write the quadratic equation whose roots are -4 and -5 and whose leading coefficient is 5 use the letter x to represent the variable. use the quadratic formula to solve for x 4x^2-9x+3=0

1. ### math help plz

Use the quadratic formula to solve the equation: 0 = x2 - 5x + 6

2. ### math

Solve the equation by completing the square. If the solutions are real, give exact and approximate answers. Otherwise, list the exact solutions. 7x^2-4x+1=2x^2-7x+3 Please help!!!!! :(

3. ### algebra

Solve the equation using the zero-product property. -9n(5n-5) a. -1/9, 1 b. 0,1***** c. -1/9,-1 d. 0,-1 Use the quadratic formula to solve the equation. if necessary, round to the nearest hundredth. x^2-6=x a. x=2,3 b. x=-2,3

4. ### Algebra

I have a few questions that I need help with. Solve the radical equation, and check all proposed solutions. 5. x- square root 3x-2=4 I don't understand this problem. Solve and check the equation. 10. (x^2+14x+49)^3/4-20=7 would I