Difference between revisions of "Quadratic formula"
m (proofreading) |
m (proofreading) |
||
Line 10: | Line 10: | ||
<math>a\cdot x^2+b\cdot x=-c</math> | <math>a\cdot x^2+b\cdot x=-c</math> | ||
− | Dividing by <math>a</math> and adding <math>\frac{b^2}{4a^2}</math> to both sides yields | + | Dividing by <math>{a}</math> and adding <math>\frac{b^2}{4a^2}</math> to both sides yields |
<math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}</math>. | <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}</math>. |
Revision as of 11:19, 19 June 2006
The quadratic formula is a general expression for the solutions to a quadratic equation.
General Solution For A Quadratic by Completing the Square
Let the quadratic be in the form .
Moving c to the other side, we obtain
Dividing by and adding to both sides yields
.
Factoring the LHS gives
As described above, an equation in this form can be solved, yielding
This formula is also called the Quadratic Formula.
Given the values , we can find all real and nonreal solutions to the quadratic equation.