Differentiate the following functions with respect to x:
x5 ex + x6 log x
Let, y = x5 ex + x6 log x
Let, A = x5 ex and B = x6 log x
∴ y = A + B
⇒
We have to find dA/dx first
As we can observe that A is a product of two functions say u and v where,
u = x5 and v = ex
∴ A = uv
As we know that to find the derivative of product of two function we apply product rule of differentiation.
By product rule, we have –
…equation 1
As, u = x5
∴ …equation 2 {∵
}
As, v = ex
…equation 3 {∵
}
∴ from equation 1, we can find dy/dx
∴
⇒ {using equation 2 & 3}
Hence,
…..equation 4
Now, we will find dB/dx first
As we can observe that A is a product of two functions say m and n where,
m = x6 and n = log x
∴ B = mn
As we know that to find the derivative of product of two function we apply product rule of differentiation.
By product rule, we have –
…equation 5
As, m = x6
∴ …equation 6 {∵
}
As, v = log x
…equation 7 {∵
}
∴ from equation 5, we can find dy/dx
∴
⇒ {using equation 6 & 7}
Hence,
…..equation 8
As,
∴ from equation 4 and 8, we have –