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Snowcat [4.5K]
3 years ago
5

Write an expression that shows how to use the halving and doubling strategy to find 28✖️50

Mathematics
2 answers:
Tatiana [17]3 years ago
7 0
28÷4=7

7×50=350  

350×4=1400  
Sonja [21]3 years ago
5 0
28÷4=7   7×50=350  350×4=1400  

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Answer:

X = \begin{bmatrix}1&3\\ 2&4\end{bmatrix}

Step-by-step explanation:

The question we have at hand is, in other words,

\begin{bmatrix}4&2\\ \:1&1\end{bmatrix}\left(X\right)=\begin{bmatrix}8&20\\ \:3&7\end{bmatrix} - where we have to solve for the value of X

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\begin{bmatrix}4&2\\ 1&1\end{bmatrix}^{-1} = \frac{1}{\det \begin{pmatrix}4&2\\ 1&1\end{pmatrix}}\begin{pmatrix}1&-2\\ -1&4\end{pmatrix}= \frac{1}{2}\begin{bmatrix}1&-2\\ -1&4\end{bmatrix} = \begin{bmatrix}\frac{1}{2}&-1\\ -\frac{1}{2}&2\end{bmatrix}

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\begin{bmatrix}1&3\\ 2&4\end{bmatrix} ... which is our solution.

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