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kumpel [21]
3 years ago
9

What is an idempotent matrix?

Mathematics
2 answers:
Yuki888 [10]3 years ago
7 0
An\ idempotent\ matrix\ is\ a\ matrix\ n\times n\ (square\ matrix\ A)\ which:A^2=A\\\\Example:\\  A=\left[\begin{array}{ccc}2&-1\\2&-1\end{array}\right]\\A^2=\left[\begin{array}{ccc}2&-1\\2&-1\end{array}\right]\cdot\left[\begin{array}{ccc}2&-1\\2&-1\end{array}\right]=\left[\begin{array}{ccc}2\cdot2-1\cdot2&2\cdot(-1)-1\cdot(-1)\\2\cdot2-1\cdot2&2\cdot(-1)-1\cdot(-1)\end{array}\right]\\=  \left[\begin{array}{ccc}4-2&-2+1\\4-2&-2+1\end{array}\right] =  \left[\begin{array}{ccc}2&-1\\2&-1\end{array}\right] =A


Fofino [41]3 years ago
7 0
A matrix E satisfying the equation E2 = E.
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Given vertices ofQuadrilateral RSTU as R(1,3), S(4,1), T(1,-3) and U(-2,-1).

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The coordinates of verticales diagonal SU are S(4,1), and  U(-2,-1),

By applying distance formula:

\mathrm{Compute\:the\:distance\:between\:}\left(x_1,\:y_1\right),\:\left(x_2,\:y_2\right):\quad \sqrt{\left(x_2-x_1\right)^2+\left(y_2-y_1\right)^2}

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SU  =\sqrt{\left(-2-4\right)^2+\left(-1-1\right)^2}.

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Diagonal RT is not congruent to Diagonal SU.

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Let's solve for x.
3
x
+
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Step 1: Add -5y to both sides.
3
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+
5
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y
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Step 2: Divide both sides by 3.
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3
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3
y
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3
Answer:
x
=
−
5
3
y
+
10
3
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