Algebra is a branch of mathematics in which we use variable for unknown quantity.

Ex: 1) *ax = b* or *ax – b = *0

2) 3*x* – 9 = 3

when we solve these equation we get : 1) *x = b/a * and in 2) *x = 4 *. This means the value of *x *in both these equations are different and can have any value, it is not fixed.

You may have thought that from where this word ‘** Algebra**‘ came. This word came from the book

**written by Mohammed ibn Musa abu Abdullah al Khowarizmi of Baghdad around 825 A.D., but much before this , Aryabhatta and Brahmagupta had already done a lot of work in this field.**

*Kitab al-muhtasar fi Hisab Aljaber w’al muqabalah*

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