# calculus

• Nov 14th 2012, 07:15 AM
IzI
calculus
(ii) $\ln{a} + \ln{b} = \ln{ab}$, and $\ln{a} - \ln{b} = \ln{\frac{a}{b}}$
This next question, I'm not sure what to do. I think you want to introduce a new variable $z=4x+7y+2$.
The second page of problems are just applying the formulas you learned. In the last one, you can cancel $y^2$ from everything, but remember that $y=0$ is going to be a solution, too.