# Math Help - Find the derivative of...

1. ## Find the derivative of...

Find the derivative of...

$10x^9-6x^4+5/x^3-8x^6-10/x^6$

for this I got the following...(am I right?)

$-90x^8-48x^5-24x^3-12/x^4+60/x^7$

my next questions is find the derivative of...

$x^3/8x^8-7x^5+1$

for this i decided I need to use the quotient rule? (am i right in doing so?)

after doing the quotient rule I got this...(am I right?)

$dy/dx=8x^8-7x^5+1*3x^2-x^3*64x^7-35x^4/(8x^8-7x^5+1)^2$

thanks

2. In the first one $-15/x^4$ instead of $-12/x^4$.

I think the second one is ok if everything after 8x^8 really is in the denominator (which you could have specified by putting it all in parentheses).