Friday, May 1, 2015

Question

Important Reminders

Solution

Actually we could have multiplied by  -4  or any multiple of  4  for that matter, but this is the set of integer solutions for which  a  is the least positive.

For part (b), if we can solve the first equation easily, then the roots of the second equation can be obtained by just squaring your answers.  However, the LHS of the first equation cannot be factorised nicely, so we might as well use the quadratic formula to solve the second equation directly.

Suitable Levels