spot the flaw in my workings | Revision Server | Page 1

sage tinsel May 30, 2024, 4:35 PM

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Can some help me spot if there’s a mistake in my working out because according to the solution there’s only 2 solutions but I got 4

finite veldt May 30, 2024, 4:39 PM

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One of your tanx values is wrong

sage tinsel May 30, 2024, 4:39 PM

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which one?

finite veldt May 30, 2024, 4:39 PM

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It’s supposed to be tanx = -1 and -0.4

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U got 0.2 (1/5)

sage tinsel May 30, 2024, 4:40 PM

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if you solve the quadratic, you get tanx is equal to 0.2 or -1 no?

finite veldt May 30, 2024, 4:40 PM

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OMG

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I put it in my calculator wrong😭😭

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Hold on

sage tinsel May 30, 2024, 4:41 PM

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its fine i think the solution just missed the other 2 solutions

finite veldt May 30, 2024, 4:42 PM

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Yh probably bc I got the same answer as you

placid cloud May 30, 2024, 4:44 PM

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there’s only 2 solutions because tanx ≠ -1

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since it would result in division by zero in the original question

finite veldt May 30, 2024, 4:45 PM

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OMD yes

sage tinsel May 30, 2024, 4:45 PM

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oh i see, i never knew we had to take that into account

#spot the flaw in my workings