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Math Help - Gradient of f(x,y)

  1. #1
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    Question Gradient of f(x,y)

    find the gradient of
    f(x, y) = 7(x^5)(y^4) − 9(x^3)(y^8)
    Please enter your answer as a row vector, using the list syntax.

    Now what i have done is below which i dont think is right for the question of row vector. Could someone help?

    (35*x^4*y^4 - 27*x^2*y^8)i + (28*x^5*y^3 - 72*x^3*y^7)j
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  2. #2
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    Actually its fine, i found out what to do. thanks anyway
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    Hello,

    Quote Originally Posted by taurus View Post
    find the gradient of
    f(x, y) = 7(x^5)(y^4) − 9(x^3)(y^8)
    Please enter your answer as a row vector, using the list syntax.

    Now what i have done is below which i dont think is right for the question of row vector. Could someone help?

    (35*x^4*y^4 - 27*x^2*y^8)i + (28*x^5*y^3 - 72*x^3*y^7)j
    Your result is correct, but you're asked a row vector, which will be :

    \overrightarrow{grad}(f)=\left(35x^4y^4-27x^2y^8 \ , \ 28x^5y^3-72x^3y^7\right)
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