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March 22 Ms. Wu says … hm, Ms. Wu is reticent today. • • • • 1) 2) 3) 4) Get out HW 4.1. Start on the warm up in pen. Keep it on your desk. Grade HW 4.1 (key on table). Grade Spring Break EOC Packet. • ANNOUNCEMENT: Late work will not be accepted after 2 weeks (this is an 8C cluster policy). – Tutorials will be this Thursday, 3/22 Find the roots of the equation 0 = x2 + 8x – 5. – Conclusion: Factoring alone is not sufficient for solving all quadratic equations. – Over next couple of weeks, we will derive a new method to solve all types of quadratic equations Completing the Square • Step 1: Complete the rectangle diagram so that it is a square. How do you know which number to place in the lower-right corner? • A) Completing the Square • Complete the rectangle diagram so that it is a square. How do you know which number to place in the lower-right corner? • B) Completing the Square • Complete the rectangle diagram so that it is a square. How do you know which number to place in the lower-right corner? • C) Step 2: For each diagram A – C, write an equation in the form x2 + bx + c = (x + b/2)2 • On which side of the equation can you isolate x by undoing order of operations? Step 3: Suppose the area for diagrams A and B is 100 square units. For each square, write an equation that you can solve for x by undoing order of operations. Step 4: Solve each equation. You will get two values for x. Try to find the solutions to x2 + 8x – 5 = 0. What if the leading coefficient, Avalue, isn’t 1? • 3x2 + 18x – 8 = 22