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Draw the truth table for the compound statement (p q) and write A B and (A B) in simple English.
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3. c) Hence or otherwise, determine the roots of the equation
The function is not provided in the image. Therefore, the roots of the equation cannot be determined.
4. a) Draw the truth table for the compound statement
Create columns for , , , and .
Fill in all possible truth values for and .
Calculate the truth values for .
The disjunction is true if at least one of or is true.
Calculate the truth values for .
This is the negation of .
T T T F T F T F F T T F F F F T 4. b) Consider the statements A: If the rain is falling B: I will use an umbrella Write in simple English
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i) This statement means "A AND B".
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ii) This statement means "NOT (A AND B)". Using De Morgan's laws, is equivalent to .
5. a) Given the matrix . Find
- i) the transpose, .
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To find the transpose of a matrix, swap its rows and columns.
$$ Q^T = \begin{pmatrix} 2 & x-2 \\ 3 & x \end{pmatrix} $$ $$ \boxed{Q^T = \begin{pmatrix} 2 & x-2 \\ 3 & x \end{pmatrix}} $$- ii) the value of for which .
For to be equal to , their corresponding elements must be equal.
$$ \begin{pmatrix} 2 & 3 \\ x-2 & x \end{pmatrix} = \begin{pmatrix} 2 & x-2 \\ 3 & x \end{pmatrix} $$Equate the off-diagonal elements.
$$ 3 = x-2 $$Solve for .
$$ x = 3+2 $$ $$ x = 5 $$ (Also, $x-2 = 3$ gives $x=5$, and the diagonal elements $2=2$ and $x=x$ are always equal). $$ \boxed{x=5} $$5. b) Consider . Calculate
- i)
means .
$$ P^2 = \begin{pmatrix} 4 & 3 \\ 1 & 2 \end{pmatrix} \begin{pmatrix} 4 & 3 \\ 1 & 2 \end{pmatrix} $$Perform matrix multiplication.
The element in row $i$, column $j$ of the product matrix is the dot product of row $i$ of the first matrix and column $j$ of the second matrix. $$ P^2 = \begin{pmatrix} (4)(4) + (3)(1) & (4)(3) + (3)(2) \\ (1)(4) + (2)(1) & (1)(3) + (2)(2) \end{pmatrix} $$ $$ P^2 = \begin{pmatrix} 16 + 3 & 12 + 6 \\ 4 + 2 & 3 + 4 \end{pmatrix} $$ $$ P^2 = \begin{pmatrix} 19 & 18 \\ 6 & 7 \end{pmatrix} $$ $$ \boxed{P^2 = \begin{pmatrix} 19 & 18 \\ 6 & 7 \end{pmatrix}} $$
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