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Is solution bank wrong or am I making a mistake? Watch

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    Hi I was just finishing off C4 Exercise 6f (edexcel) when I got stuck on the very last question. I got the answer wrong and I can spot where the solution bank did it differently but I don't know why. In the picture attached you can see that dx/sqrtx = 2du which I got but when they sub it in they used dx = 2du. Am I missing something? There's some long exercise in this chapter and it's really drained me 😅Name:  ImageUploadedByStudent Room1421768470.160417.jpg
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    I should also put the question. Here it is Name:  ImageUploadedByStudent Room1421768698.846265.jpg
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    The root(x)'s cancel. Read the workings carefully and you should see it.

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    Thanks for the help just realised the mistake 😊


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