Ap Calculus Answer Sheet

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Algebra question, should be easy, but it is not.?

Recently (today) decided to look over the questions that I was wrong on my PSAT. In doing so, I realized all my math was incorrect answers stupid mistakes (misinterpretation of the question, in addition to errors etc.) However, there is a question that still can not understand, so I'm here to see if someone can explain it to me. It is as follows: In the equation x ^ 2 + 4 = kx (x + c) ^ 2, KYC are positive constants. While it is true for all values of x, what is the value of k? A. 2 B. 4 C. 8 D. 16 E. 32 The answer is 4, in agreement with PSAT score sheet, but I can not find a way to solve this problem. Can someone explain to me step by step? It is especially frustrating since I'm in calculus AP and I am perplexed by a simple algebra problem …

Think FOIL, factor on the left side in a perfect square with a final period of 4 (x +2) ^ 2 = (x + c) ^ 2 now multiply the left side x ^ 2 +4 x 4 and you can see that k is actually 4

AP Calc Richard’s Group 3


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