Find the derivative of a function with new variable Suppose f(x-3)=(x-2)^{2}

Pamela Meyer

Pamela Meyer

Answered question

2022-01-13

Find the derivative of a function with new variable
Suppose f(x3)=(x2)2 and find the f(x2+5)

Answer & Explanation

Jeremy Merritt

Jeremy Merritt

Beginner2022-01-14Added 31 answers

Step 1
You calculated the derivative of the composite function
xf(x2+5),
and evaluated it at x, rather than calculating the derivative of the function tf(t), and evaluating it at x2+5. Note that by definition
(xf(x2+5))(x)
=limh0f((c+h)2+5)f(x2+5)h
whereas
(tf(t))(x2+5)=limh0f(t+h)f(t)ht=x2+5
=limh0f(x2+5+h)f(x2+5)h
Serita Dewitt

Serita Dewitt

Beginner2022-01-15Added 41 answers

Step 1
As a method to proceed:
f(g(x))=g(x)f(g(x))
Set
g(x)=x2+5
So,
g(x)=2x
For x non zero,
f(x2+5)=f(g(x))2x

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