Question

Solve x2 + 2x + 9 = 0

Solve x2 - 7x = -13

Solve -3x2 - 4x - 4 = 0

Solve 3x2 = -12x - 15

Solve -2x2 - 16x - 44 = 0

Answer 1

Hint: Use the quadratic equation, it will solve for all these.
Remember that a = the coefficient of the squared term (1 for the first one), b = the coefficient of the non-squared variable (2 for the first one) and c is the constant (9 for the first one). Then:\[x_{1/2} = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\]Solves these quadratic.

Answer 2

i already have all the soluations, i neeed my work checked.. and to compare anwsers

Answer 3

bmp is right, you should use quadratic equation for this.

Answer 4

You can write your steps, and we can see if they're correct.

Answer 5

http://www.wolframalpha.com/input/?i=solve+x%5E2+%2B2x%2B9%3D0
use wolfram to check yourself