Posted by **upset ** on Friday, May 28, 2010 at 2:03am.

Solve by using the quadratic formula

x^2-4x-45=0

- math -
**drwls**, Friday, May 28, 2010 at 7:53am
Look up the quadratic formula.

x = [-b +/-sqrt(b^2-4ac)]/2a

Then apply it. (a,b,c are the coefficients and constant in the equation)

You should get an integer solution since the equation can easily be foactored to give (x-9)(x+5) = 0

the solutions are 9 and -5.

Hint: b^2 - 4ac = 16 + 180 = 196, which had integer square roots + or - 14.

## Answer This Question

## Related Questions

- College Math II - Solve by using the quadratic formula. x^2 + 6x + 6 = 0 I am ...
- Math - Solve for the zeros of the function using the quadratic formula. 3x^2=-4x...
- math-calculus - solve equation |x^2-2x-6| using quadratic formula. i not get how...
- Math - Use the quadratic formula to solve each of the following quadratic ...
- Math using Quadratic equation - The area of a square is 196cm2(squared), find ...
- Math!Please Help Me! - Solve the following quadratic by either factoring or ...
- Math - Using the quadratic formula solve xsquared=2/3x Using the quadratic ...
- Math - Solve the given quadratic equation exactly using the quadratic formula. ...
- Math - Solve the given quadratic equation exactly using the quadratic formula. ...
- algebra II - I'm quite clueless as to how to solve this. I know the quadratic ...

More Related Questions