8. Compute the directional derivative of the following function at the given point P in the direction of the given vector. f(x, y, z) = ln (5x+4y) on P(3,9), u = 6i+8) gil) sciarstab of dess noitonul garwollot it to aliog Inostro od bart 01 hangespoo iniog Insidio dos dadw

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A: According to our company policy we can answer only first question and rest can be reposted. Thanks

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