Jorge's Class
Daily Updated Notes
Started Off...Started off in class with a warm up, eventually leading up to the lesson that we learned about today. The lesson was on finding x intercepts/roots/zeros/solutions, how standard from equals to vertex form and equaling them to zero. Also, there was a worksheet that was passed out and was only classwork. Notes Standard Form - x^2 + 8x + 15 Vertex Form - (x+4)^2 - 1 Are these the same? Are the equal to each other? If so how? Why? We answered tehse questions. Starting with standard form, you can factor that out easily. (x+3)(x+5) and equal them to zero. Giving you x = -3 & x = -5. Lets see what we get with the vertex from. First you want to get rid of the -1 that is there because it'll get in the way of the next step. So you add +1 on both side. Now you square root both side to get rid of the squared. All you have now is 1=x + 4. BUT the 1 is now a negative AND a positive (because a + & + is a + and - & - is also a +) which is crucial. Subtract 4 on both sides meaning 1 - 4 = -3 & -1 - 4 = -5. -5 & -3 are your x intercepts which is what we got with the standard form.
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December 2016
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