Put the equation into the following form: ax2+bx+c=0 Then plug the values for a, b, and c into the quadratic formula. Do the arithmetic to find the value for x twice, once using + after the -b in the numerator, and once using - after -b in the numerator. You will get two different values for x, one using + and the other using -. Give both possible values for x when you give your answer. Here is the quadratic formula:
x= -b+-square root(b2-4ac)/2a
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There are an infinite number of different quadratic equations. The quadratic formula is a single formula that can be used to find the pair of solutions to every quadratic equation.
Well, if the given quadratic equation cannot be factored, nor completed by the square, try using the quadratic formula.
Quadratic formula. It's easier to remember and you have to do less work.
For any quadratic ax2 + bx + c = 0 we can find x by using the quadratic formulae: the quadratic formula is... [-b +- sqrt(b2 - 4(a)(c)) ] / 2a
The quadratic formula is x=-b (+or-) square root of b2-4ac all over 2a