## anonymous one year ago Solve x2 - 7x = -13

1. anonymous

2. anonymous

$x ^{2}-7x=-13 ?$

3. anonymous

yeah sorry i forgot to include the ^

4. anonymous

$x ^{2}-7x+13=0$ you can use the general solution $x_{1}= \frac{ -b+\sqrt{b ^{2}-4ac} }{ 2a }$ $x_{2}= \frac{ -b-\sqrt{b ^{2}-4ac} }{ 2a }$ where a=1 b=-7 c=13

5. anonymous

so basically to solve these types of equations you just substitute and simplify with the quadratic formula?

6. anonymous

It is the general method for quadratic equations (works for all the quadratic equations .. but there are some equations where you could do other methods to factoring

7. anonymous

There is another way, which is completing the square, but doing the quadratic formula is fine.

8. anonymous

Thank you soon much!

9. anonymous

soooo*

10. anonymous

jaja, you're welcome :)

11. anonymous

Hint: The answer has imaginary numbers. :)