Tayng's answer to liang liang's Secondary 3 A Maths Singapore question.

done {{ upvoteCount }} Upvotes
clear {{ downvoteCount * -1 }} Downvotes
Tayng
Tayng's answer
1093 answers (A Helpful Person)
1st
Got two ways to find k but I recommend the quadratic equation way cause the other way you need know got two solutions