2. A two-digi number is such that the product of the digits is 18. If 27 is subtracted from the number, the digits are interchanged. Find the number.
3. If the roots of
4. If p and q are the roots of the equation, form the equation whose roots are
It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.
Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.