i have been given a question and i don't know how to work it out please help. green line is 3 cm and red line is cm the circle is supposed to just be touching the square, i might have put something wrong but it is about this help...
Have a look at the factors.
When you multiply them, the answer is zero.
So, either factor is zero for a certain value of R.
What values of R make those factors 0 ?
Kito, since you obviously don't understand how the quadratic formula works,
then you are not ready for this problem. Suggest you talk to your math teacher.