I can solve this question by using the quadratic formula but want to see how to solve by completing the square.
So my working is:
But how do I get rid of the . And is the above correct so far.
My problem is that multiplying both sides by -5 means number on rhs will be negative and so no solution. But I know the curve does cross the x axis - so there is a solution. Can anyone show me the final steps to solve this using completing the square?