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URGENT MATH HELP NEEDED PLEASE HELP!

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In a triangle ABC with vertices A(2,-1) and B(-1,1), the gradient of AC and AB are 2m and m respectively, find the coordinates of C if BAC = 90 degree
 
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In a triangle ABC with vertices A(2,-1) and B(-1,1), the gradient of AC and AB are 2m and m respectively, find the coordinates of C if BAC = 90 degree
Post a picture of the question or recheck it properly. Something seems wrong in it.
 
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The question is wrong. If angle BAC = 90; the product of gradient of AC and gradient of AB should be equal to -1.
 
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