Question

Find the derivative of the function using the power rule.

f(x) = x(4x+9)^5

Answer 1

well... also using the chain-rule I'd think

Answer 2

1(4x+)^5 + x*5((4x+9)^4)*4

Answer 3

Think you can work it out from there?

Answer 4

hint: use product rule and chain rule

Answer 5

Yeah, I got (4x+9)^4(24x+9)

Answer 6

Not quite, more like
(4x+9)^5 + x*5((4x+9)^4)*4
(4x+9)^5 + 20x(4x+9)^4

Answer 7

I just plugged it into my hw and it was correct

Answer 8

Can you show me how you did it? Because the way you've done it doesn't make very much sense. You need to use the product rule and the chain rule to accurately answer it. Just using the product rule disregards some parts of the equation.

Answer 9

I used the chain rule as well

Answer 10

That's the only way I got it. The hw only says to use the product rule and that's why I kept getting the wrong answer