3 years ago

Can I get help with number 20

Mathematics

2 answers:

tekilochka [14]3 years ago

7 0

Answer:

Step-by-step explanation:

bezimeni [28]3 years ago

6 0

Answer:

-5/4

Step-by-step explanation:

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Answer:

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2 years ago

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<h3>Answer</h3>

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3 years ago

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A square matrix A is said to be idempotent iff A2 = A. (i) Show that if A is idempotent, then so is I − A. (ii) Show that if A i

muminat

Answer:

Step-by-step explanation:

Given that A is a square matrix and A is idempotent

$A^2 = A$

Consider I-A

i) $(I-A)^2 = (I-A).(I-A)\\= I^2 -2A.I+A^2\\= I-2A+A\\=I-A$

It follows that I-A is also idempotent

ii) Consider the matrix 2A-I

$(2A-I).(2A-I)=\\4A^2-4AI+I^2\\= 4A-4A+I\\=I$

So it follows that 2A-I matrix is its own inverse.

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3 years ago

Mary’s grade on her research paper counts for 20% of her final grade in english. if there are a total of 400 points possible how

sweet-ann [11.9K]

Answer:

80 points

Step-by-step explanation:

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dangina [55]

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3 years ago