Hello,
x²+16x+63=0
==>x²+9x+7x+63=0
==>x(x+9)+7(x+9)=0
==>(x+9)(x-7)=0
Solution={-9,-7} Solution={-9,-7}
Answer:
total number of students is 25
AIZA AND GLAIZA came 60% of the 25 students that is 15th position
A) therefore students which came below them were= 10
B) Students who has scored greater than them were=> 15-2=13 (as they niether got less than 12 nor more than 12.)