Free GMAT Practice Questions
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recent discussion across these questionsGot 5 as my answer. The two terms end up being conjugates of each other so they add nicely.
onProblem Solving · Roots—What is the value of \left( 1 5+ 3+ 1 5- 3\right)^2?Why is the answer 10 and not 15? I get that x_k=15, but I'm confused about how n relates to k.