having problems in cross-sections (finding unknowns)

[biggyshark]

Hi. I would like to ask how to do this question. In this question, I need to find the values of r and s. However, as I don’t have the ans of this question, I would like to ask how many unknown values (1 or 2 unknowns??) are there for each r and s in these kind of maths questions. So if there should be 2 unknowns for each r and s, then I would like to ask how to do it. Thank you very much <33

 

[BigBeachBanana]

View attachment 33784
Hi. I would like to ask how to do this question. In this question, I need to find the values of r and s. However, as I don’t have the ans of this question, I would like to ask how many unknown values (1 or 2 unknowns??) are there for each r and s in these kind of maths questions. So if there should be 2 unknowns for each r and s, then I would like to ask how to do it. Thank you very much <33

What is the exact instruction?
You started out with quadratic expression with no equal sign, factored and set it equal to 0 to find the roots.

 

[Steven G]

If r equals both 7s and 2s, then what can you say about r? About s?