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3 years ago

How to do ii) Deduce A^-1 = A^2 based on A^3=I

Mathematics

1 answer:

blsea [12.9K]3 years ago

8 0

Multiply by $A^{-1}$ on the right of both sides of $A^3=I$ , then use the fact that matrix multiplication is associative.

If $A^3=I$ , then

$A^3A^{-1}=IA^{-1}$

$A^2(AA^{-1})=A^{-1}$

$A^2I=A^{-1}$

$\implies A^2=A^{-1}$

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!!!!!!!!!!!!!!!!!!!!!!!!!! Plz

krok68 [10]

Answer:

The Option is A.

Acute angle:

Acute angle is the angle whose measure angle is less than 90°.

Since ,∠ LHF is 90° and ∠ KHL is within ∠ LHF

∴ ∠ KHL is an Acute angle.

Step-by-step explanation:

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Acute angle is the angle whose measure angle is less than 90°.

Since ,∠ LHF is 90° and ∠ KHL is within ∠ LHF

∴ ∠ KHL is an Acute angle.

Right angle:

The measure of an angle equal to 90° is called a right angle.

∠ LHF is a right angle.

Obtuse angle:

Obtuse angle is the angle whose measure angle is more than 90°.

∠ LHJ is an obtuse angle.

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3 0

3 years ago

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levacccp [35]

Answer:

$m(n) = 24 (0.75)^n$

Step-by-step explanation:

1) The two points are:

a) On the first swing she swings forward by 18 degrees: (1, 18)

b) On the second swing she only comes 13.5 degrees forward: (2,13.5)

2) The general equation using the form given is:

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3) Substitute the two points:

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4) Divide the second equation by the first one:

⇒ 13.5 / 18 = B

⇒ B = 0.75

5) Substitue B = 0.75 into the first equation:

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Hence, the equation is:

$m(n) = 24 (0.75)^n$

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4 years ago

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Bas_tet [7]

Answer:

58.333....

Step-by-step explanation:

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3 years ago

Read 2 more answers

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timofeeve [1]

This question says that its 3/4 of 24, thats would be 18.... and since they need 13 they're done! :)

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3 years ago

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Pani-rosa [81]

Answer:

0.0001

Step-by-step explanation:

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3 years ago