I am trying to factor trinomials:ax^2+bx+c.  There is nothing under solve that say anthing about trinomials. Explain, I don't know much about math.

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Try -b+- SQR(b^2 - 4ac)/2a.  This will give you two values depending on whether you use the + sign or the - sign after the b.  This is called the quadratic formula.  It always works even if the answers are imaginary numbers!  You can test for that first by evaluating the numbers inside the parenthesis above.  If they end up being negative total, then your answers are imaginary numbers. Your should learn some common patterns like perfect squares and difference of two squares also.  A plus sign for c means the factors of c have the same sign.  If the b sign is positive, both c factors are positive.  If the b sign is negative, both c factors are negative.  If the c sign is negative, then the c factors have opposite signs.  Whatever the b factor sign is, the largest product of a factors and c factors will have that sign.    Hope that helps.  You may be asking for the calculator to solve your trinomial. If you have a TI-83 or TI-84, get the PolySim app.

What James said. MRREEEOOWWW.....