[code][/code]If you are struggling, look at varying the value of [math]\lambda[/math]. What is this showing? How will this help you solve the problem? [br]Consider the point [math]R[/math], and the vector [math]PR[/math] or [math]RP[/math], how is this useful in solving the problem.

Explain your step by step method for solving this kind of problem. A similar approach will be needed for subsequent questions.

When altering [math]\lambda[/math], what is the purpose of this, and what does this show you in terms of finding a solution?

If you were to change the distance required in this question, what limitations would there be on the possible values of [math]d[/math] such that this would have a solution?[br]Does this tell us anything useful? (This should answer should link into the next problem)

Explain your step by step method for solving this kind of problem.