Question

for what purpose we use algebra

Answer 1

to find any hide no...s

Answer 2

The fact is that all modern technology relies on mathematics and algebra - Google, the internet, mobile phones, satellites and digital televisions wouldn’t exist without algebra.  You are relying on other people having studied algebra when you use a phone or play a computer game and as technology is everywhere more and more people are needed to work behind the scenes with knowledge of mathematics and algebra.  If you like algebra, then you are giving yourself a chance of getting a job in the rapidly expanding technology sector.