Posted by Henry on .
Differentiate each function
a) y = 3x^2 + 5x  4
b) f(x) = 6/x  3/(x^2)
c) f(x) = (3x^2  4x)(x^3 + 1)
the answers i got for each was:
a) y'= 6x + 5
b) f'(x)= 6/x^2 + 6/x^3
c) f'(x)= 15x^4 + 6x  16x^3  4
please double check and let me know if these are correct, thank you.

Calculus  please check my work 
MathMate,
All correct, well done!

Calculus  please check my work 
Henry,
thank you! can u help me on this question please
determine the coordinates of two points on the plane with equation 5x + 4y  3z = 6 
Calculus  please check my work 
MathMate,
Any point on the plane will satisfy the equation.
Since there are three variables x,y and z, you can fix any two variables and solve for the third.
Example:
Assuming arbitrarily y=6, z=6
=>
5x+4(6)3(6)=6
5x+2418=6
5x=0
x=0
So (0,6,6) is a point on the plane. 
Calculus  please check my work 
Henry,
thank you

Calculus  :) 
MathMate,
You're welcome!