1. 4.2 Matrix Multiplication Warm-up (IN) Give the dimensions of each matrix. Identify the entry at each location of the matrix. Learning Objective: to multiply two matrices and to use matrix multiplication to solve mathematical and real-world problems. 2x4 3x2 0 -2 1

2. Notes Ex 1 – Use matrix multiplication to find the final score for a football team who scored 5 touchdowns, 4 extra points, and 2 field goals. Learning Objective: to multiply two matrices and to use matrix multiplication to solve mathematical and real-world problems. touch downs extra points field goals Point values 2 matrices can only be multiplied if the # of columns in the 1 st matrix = the # of rows in the 2 nd matrix 1x33x1= The dimensions of the result will be the # of rows by the # of columns! 1x1

3. Learning Objective: to multiply two matrices and to use matrix multiplication to solve mathematical and real-world problems. Ex 2 – Let a. Find JK (if possible) 2x2 b. Find KJ (if possible) 44

4. Learning Objective: to multiply two matrices and to use matrix multiplication to solve mathematical and real-world problems. Ex 3 – Let Find AB and BA (if possible) 2x32x2 ABNot possible!

5. HW – p. 229-231 #7-19 odd, 25 Out – What is necessary for 2 matrices to be multiplied? Summary – Today, I think… POW!!