Solving Equations. What are we going to do if we have non-zero values for a, b and c but can't factor the left hand side? This will not factor so we will.

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Presentation transcript:

Solving Equations

What are we going to do if we have non-zero values for a, b and c but can't factor the left hand side? This will not factor so we will complete the square and apply the square root method. First get the constant term on the other side by subtracting 3 from both sides. We are now going to add a number to the left side so it will factor into a perfect square. This means that it will factor into two identical factors. If we add a number to one side of the equation, we need to add it to the other to keep the equation true. Let's add 9. Right now we'll see that it works and then we'll look at how to find it. 99

Now factor the left hand side. two identical factors This can be written as: Now we'll get rid of the square by square rooting both sides. Remember you need both the positive and negative root!  Subtract 3 from both sides to get x alone. These are the answers in exact form. We can put them in a calculator to get two approximate answers.

Okay---so this works to solve the equation but how did we know to add 9 to both sides? 99 Before we noticed that the middle term was equal to:

Okay---so this works to solve the equation but how did we know to add 9 to both sides? 99 Before we noticed that the middle term So to complete the square, the number to add to both sides is… the middle term's coefficient divided by 2 and squared (as long as a=1)

Let's solve another one by completing the square. Since it doesn't factor get the constant on the other side ready to complete the square. So what do we add to both sides? 16 Factor the left hand side Square root both sides (remember  ) Add 4 to both sides to get x alone the middle term's coefficient divided by 2 and squared

Let's solve another one by completing the square. Since it doesn't factor get the constant on the other side ready to complete the square. So what do we add to both sides? 25 Factor the left hand side Square root both sides (remember  ) Subtract 5 from both sides to get x alone the middle term's coefficient divided by 2 and squared

You try: x 2 - 8x + 3 = 0 x 2 -10x +7 = 0 x 2 +14x - 43 = 0