Austin Ho

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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)...

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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...

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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...