Use the quadratic formula to solve the equation, Algebra

Example :  Use the quadratic formula to solve following equation.

                           x2+ 2x = 7

Solution

Here the important part is to ensure that before we begin using the quadratic formula that we contain the equation in standard form first.

                                                       x2 + 2 x = 7

Thus, the first thing that we have to do here is to put the equation in standard form.

                                       x2 + 2 x - 7 = 0

At this point we can recognize the values for employ in the quadratic formula. For this equation we contain.

                            a=1            b = 2               c = -7

Notice the "-" along with c. It is significant to ensure that we carry any minus signs along with the constants.

At this instance there actually isn't anything more to do other than plug in the formula.

2468_Use the quadratic formula to solve the equation.png

For this equation there are two solutions. There is also some simplification which we can do. However we have to be careful.  One of the larger mistakes at this instance is to "cancel" two 2's in the numerator & denominator.  Recall that to cancel anything from the numerator or denominator then it has to be multiplied by the whole numerator or denominator. As the 2 in the numerator isn't multiplied by the whole denominator it can't be canceled out.

In order to do any simplification here we will first need to reduce the square root. At that instance we can do some canceling.

1282_Use the quadratic formula to solve the equation1.png

That's a much nicer answer to deal along with and thus we will almost always do this sort of simplification while it can be done.

Posted Date: 4/6/2013 5:02:39 AM | Location : United States







Related Discussions:- Use the quadratic formula to solve the equation, Assignment Help, Ask Question on Use the quadratic formula to solve the equation, Get Answer, Expert's Help, Use the quadratic formula to solve the equation Discussions

Write discussion on Use the quadratic formula to solve the equation
Your posts are moderated
Related Questions
What we desire to do in this section is to begin with rational expressions & ask what simpler rational expressions did we add and/or subtract to obtain the original expression. The

How do I solve this equation (the left side is a matrix: 0 0 -1 3 x 0 = x^2 2 0 3


Sketch the graph of                                                f( x ) = e x . Solution Let's build up first a table of values for this function. x




The sum of the sides of a triangle is 9 2/9 inches.If the two sides measure 5/3 inches and 3 1/6 inches,find the measure of the third side

Earthquake Intensity Commonly the Richter scale is utilized to measure the intensity of an earthquake. There are several different ways of computing this depend on a variety of

I am supposed to put y= -2x-16x-32 in vertex form and identify the vertex , axis of symmetry, and direction of opening.