Austin Ho

1. Comunidade
2. Study Group
3. Trigonometry Question

Don't take my word for it, but generally in precalc, you take the SIDE OPPOSITE of the angle as you'll see in the law of sines/cosines (etc. later).  The side length opposite from pi/6 (30 degrees)...

1. Comunidade
2. Study Group
3. Integration by substitution problem

When you integrate the above, you're right with u=x+2.   (integrate) x/(sqrt(x+2)) dx (integrate) x/sqrt(u) dx, where u=x+2 and du=dx. So you'd get: (integrate) x/sqrt(u) du I think your question i...

1. Comunidade
2. Study Group
3. Algebra sample problem question

After solving the equation, you'll get y=3x^2+9x-30.  That'd be the simplified equation and you don't have to do anything.   I'm assuming that you mean solving for x when y=0?  Then there'd be a di...