Brahmagupta

598–670 · Indian mathematician and astronomer (c. 598 – c. 668 CE)

Topics: mathematics

• In a linear equation in one unknown, the difference of the two known terms taken in the reverse order, divided by the difference of the coefficients of the unknown (is the value of the unknown).

  — Brahmagupta

• The square of negative or positive is positive; of zero, is zero. The root of a square is such as was that from which it was raised [i.e. either positive or negative]. (37).

  — Brahmagupta