Q. After using , I got the answer, However, its very different from the answer at the back of the book. I have checked and rechecked but ended up with the same wrong answer.
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Originally Posted by Altair Q. Mr F says: You have two dy's here. I'm guessing one of them is meant to be a dx. Which one - the red or the blue? After using , I got the answer, However, its very different from the answer at the back of the book. I have checked and rechecked but ended up with the same wrong answer. ..
The red one.
Originally Posted by Altair The red one. . Substitute . Then . Therefore: . Therefore: . I'll leave to you to take it as further as necessary.
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