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anonymous
 5 years ago
1) find d^2f/dx^2
when f(x) = x e^7y+5y
2) find d^2f/dx dy
when f(x) = x e^8y+3y
anonymous
 5 years ago
1) find d^2f/dx^2 when f(x) = x e^7y+5y 2) find d^2f/dx dy when f(x) = x e^8y+3y

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anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0two different questions here question (1) find d^2f/dx^2when f(x) = x e^7y+5y question (2) find d^2f/dx dy when f(x) = x e^8y+3y

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0deriveing twice I assume

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0do we do partials? or implicits?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0well, since f(x) implies one variable id conjecture implicits

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2hmm since its wrt x and both are linear wrt x then the 2nd derivatives are 0

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0\[ x e^{7y} + 5y\] by chance?

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2oh i was assuming partial

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0those groupings are a pain if you dont get them right

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0x e^(7y) + 5y x' e^(7y)+ x e^(7y)' + 5 y' e^(7y) 7x e^(7y) y' + 5 y' then again

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i have loads of these, need to be handed in ten minutes haha

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0the second one there suggests partials but its only a single variable

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2amistre, you are finding dy/dx not df/dx though

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0f(x) assumes that all variables are functions of x, so y = y(x)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0the 2nd on tho says f(x) and wants f_xy

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2i think it should be written f(x,y) otherwise it would have asked for dy^2/dx right?

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0i think there might be some confusion as to whether f(x) IS y rather than written out is a rule with x(x) and y(x)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0hard for me to parse the intricate details tho :)

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2agreed...salman little help?

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0its d^2f/dx dy the f(x)=xe^8y+3y sorry chaps, this is the only info i have

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2ok, then assuming f(x) is not y, y is just another variable df/dx = e^8y d/dy e^8y = 8*e^8y

dumbcow
 5 years ago
Best ResponseYou've already chosen the best response.2for part a) df/dx = e^7y d/dx e^7y = 0
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