Math Problem Statement

Diketahui matriks A = [[4, -1], [3, 2]] dan B = [[-3, -2], [1, 5]], maka 3A + 2B adalah?

Solution

This image contains a matrix problem. The problem provides two matrices A and B, and asks for the result of the expression 3A+2B3A + 2B. Let's first break down the given matrices and perform the necessary calculations.

Given: A=[4132],B=[3215]A = \begin{bmatrix} 4 & -1 \\ 3 & 2 \end{bmatrix}, \quad B = \begin{bmatrix} -3 & -2 \\ 1 & 5 \end{bmatrix}

We need to calculate 3A+2B3A + 2B.

Step 1: Multiply matrix A by 3:

3A=3×[4132]=[12396]3A = 3 \times \begin{bmatrix} 4 & -1 \\ 3 & 2 \end{bmatrix} = \begin{bmatrix} 12 & -3 \\ 9 & 6 \end{bmatrix}

Step 2: Multiply matrix B by 2:

2B=2×[3215]=[64210]2B = 2 \times \begin{bmatrix} -3 & -2 \\ 1 & 5 \end{bmatrix} = \begin{bmatrix} -6 & -4 \\ 2 & 10 \end{bmatrix}

Step 3: Add 3A3A and 2B2B:

3A+2B=[12396]+[64210]3A + 2B = \begin{bmatrix} 12 & -3 \\ 9 & 6 \end{bmatrix} + \begin{bmatrix} -6 & -4 \\ 2 & 10 \end{bmatrix} =[12+(6)3+(4)9+26+10]=[671116]= \begin{bmatrix} 12 + (-6) & -3 + (-4) \\ 9 + 2 & 6 + 10 \end{bmatrix} = \begin{bmatrix} 6 & -7 \\ 11 & 16 \end{bmatrix}

So, the result of 3A+2B3A + 2B is: [671116]\begin{bmatrix} 6 & -7 \\ 11 & 16 \end{bmatrix}

The correct answer corresponds to option e.

Would you like more details on this solution or have any questions?

Here are some related questions:

  1. How do you multiply matrices by a scalar?
  2. How do you add matrices together?
  3. What is the concept of matrix operations?
  4. Can matrix multiplication and scalar multiplication be combined?
  5. How do you verify matrix results for correctness?

Tip: Always check if the dimensions of matrices match before performing operations like addition or subtraction.

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Math Problem Analysis

Mathematical Concepts

Matrix Operations
Scalar Multiplication
Matrix Addition

Formulas

Scalar Multiplication: c * A = c * [a_ij]
Matrix Addition: A + B = [a_ij + b_ij]

Theorems

Matrix Scalar Multiplication and Addition Rules

Suitable Grade Level

Grades 10-12