Solving Quadratic Equations by the Quadratic Formula??

Question

1. x^2 - x - 6 = 0

2. x^2 = -8 - 6x

3. 20 = 2x^2 + 3

4. 2x^2 - 3x - 4 = 0

5. 9x^2 - 12x = 1

Answer 1

1) x1=3  x2=-2

2) x1= - 4    x2= - 2

3) x1= - 4    x2=5/2=2.5

4)x1,2=(3+_sqrt41)/4

5) x1,2=(2+_sqrt5)/3

Answer 2

For example:

3.  20 = 2x^2 + 3

Rewrite into standard decreasing exponent form:

2x^2 + 0x - 17 = 0

Notice that one side of the equation must equal zero

x = [0 +/- [0 - (4)(2)(-17)]^0.5]/(2)(2)

x = +/- [136^0.5]/4

x = +/- 2.87

Answer 3

I ******* hate it when people put their homework on.

You could ask for help or an example, but no. You actually expect me to do your homework for you!

Answer 4

you should try this, I'm too tired to help sorry... night everyone... http://www.purplemath.com/modules/solvqu...