Five marks exercise problems III — task. Mathematics State Board, Class 10.

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1. Find \(X\) and \(Y\) if \(X + Y =\)

(\begin{array}{l} 7 & 0 \\ 3 & 5 \end{array})

and \(X - Y\) \(=\)

(\begin{array}{l} 3 & 0 \\ 0 & 4 \end{array})

Answer:

X = (\begin{array}{l} i & i \\ \frac{i}{i} & \frac{i}{i} \end{array})

Y = (\begin{array}{l} i & i \\ \frac{i}{i} & \frac{i}{i} \end{array})

2. If \(A =\)

(\begin{array}{l} 0 & 4 & 9 \\ 8 & 3 & 7 \end{array})

, \(B =\)

(\begin{array}{l} 7 & 3 & 8 \\ 1 & 4 & 9 \end{array})

find the value of

(i) \(B - 5A\) \(=\)

(\begin{array}{l} i & i & i \\ i & i & i \end{array})

(ii) \(3A - 9B\) \(=\)

(\begin{array}{l} i & i & i \\ i & i & i \end{array})

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6. Five marks exercise problems III