Question

what is the summation of (a^2)b. Expand it.

Answer 1

In mathematics, summation (denoted with an enlarged capital Greek sigma symbol ) is the addition of a sequence of numbers; the result is their sum or total. If numbers are added sequentially from left to right, any intermediate result is a partial sum, prefix sum, or running total of the summation

Answer 2

Answer:

Firstly, you need to know until which point you need to keep adding.

For example if you have a, b, c then Σab = ab + bc + ca

But for example if you have a, b, c then

Σa²b = a²b + a²c + b²a + b²c + c²a + c²b

or if you have a, b, c, d then

Σa²b = a²b + a²c + a²d + b²a + b²c + b²d + c²a + c²b + c²d + d²a + d²b + d²c