Question Video: Determining an Element of a Matrix | Nagwa Question Video: Determining an Element of a Matrix | Nagwa

# Question Video: Determining an Element of a Matrix Mathematics • First Year of Secondary School

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Given π΄ = [8, β3, 11, 4 and 5, β5, 9, 2 and β1, 34, 0, β7], what is πββ?

01:26

### Video Transcript

Given the matrix π΄, which is equal to eight, negative three, 11, four, five, negative five, nine, two, negative one, 34, zero, negative seven, what is π subscript two three?

This notation, a lower case π and then two subscript numbers, is used to denote the position of one of the elements in the matrix upper case π΄. In general, if we were asked for the element π subscript ππ, then this would mean the element of matrix π΄ which is in row π and column π. So, π and then subscript two three means the element of the matrix upper case π΄, which is in the second row, row two, and the third column.

Letβs find this element then in our matrix π΄. Itβs in the second row and itβs in the third column. We see that the element in this position is the number nine. So, we can say that the element π subscript two three of the matrix uppercase π΄ is nine. Remember, when weβre talking about the position of an element in the matrix, or indeed, the order of that matrix, itβs rows first and columns second.

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