A student expands (x - y)2 incorrectly as x2 + y2.

      

A student expands (x - y)2 incorrectly as x2 + y2. Find his percentage error if he used this incorrect expansion for x = 4 and y = -5. Give your answer correct to 2 d.p.

  

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Wilfred
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Wilfykil answered the question on August 19, 2019 at 13:16


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