# Chapter 1

## class 9th math 1.4 solution

Question#1: Which of the following product of matrices is conformable for multiplications? \(i\) \[\left[ \begin{matrix} 1 & -1 \\ 0 & 2 \\\end{matrix} \right]\left[ \begin{matrix} -2 \\ 3 \\\end{matrix} \right]\] Solution: \[\begin{align}\left[ \begin{matrix} 1 & -1 \\ 0 & 2 \\\end{matrix} \right]\left[ \begin{matrix} -2 \\ 3 \\\end{matrix} \right]\\\text{Order of first Matrix}&=2-by-\bbox[5px, border: 1px solid red]{2} … Read more

## class 9th math 1.5 solution

Question#1: Find the determinant of the following matrices. \(i\) \[A=\left[ \begin{matrix} -1 & 1 \\ 2 & 0 \\\end{matrix} \right]\] Solution: \[\begin{align} \left| A \right|&=\left| \begin{matrix} -1 & 1 \\ 2 & 0 \\\end{matrix} \right| \\ & =\left( -1 \right)\left( 0 \right)-\left(1 \right)\left( 2 \right) \\ & =0-2 \\ & =-2 \\ \end{align}\] \(ii\) \[B=\left[ \begin{matrix} 1 & 3 … Read more