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Tresset [83]
2 years ago
5

Find the derivative for the function.

Mathematics
1 answer:
dalvyx [7]2 years ago
5 0

The rule for deriving a multiplication is

(f(x)\cdot g(x))' = f'(x)g(x)+f(x)g'(x)

Also, we can forget about the factor 4 for now, since we have

(4f(x)\cdot g(x))' = 4(f'(x)g(x)+f(x)g'(x))

So, we will just multiply everything by 4 at the end. Our functions are

f(x) = (x^7-9)^{12},\quad g(x) = (4x+8)^{11}

For both derivatives we will use the rule

(f(x)^n)' = n\cdot f(x)^{n-1}\cdot f'(x)

So, we have

f'(x) = 12\cdot(x^7-9)^{11}\cdot 7x^6,\quad g'(x) = 11\cdot(4x+8)^{10}\cdot 4

We can simplify those expression a little bit:

f'(x) = 84x^6(x^7-9)^{11},\quad g'(x) = 44(4x+8)^{10}

The formula f'(x)g(x)+f(x)g'(x) thus becomes

84x^6(x^7-9)^{11}\cdot (4x+8)^{11} + (x^7-9)^{12} \cdot 44(4x+8)^{10}

And so the final answer is

4(84x^6(x^7-9)^{11}\cdot (4x+8)^{11} + (x^7-9)^{12} \cdot 44(4x+8)^{10})

If you simplify this expression by factoring common terms, you will see that the correct answer is the first one.

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