Calculus  please check my work
posted by Henry
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.

MathMate
All correct, well done!

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 
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. 
Henry
thank you

MathMate
You're welcome!
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