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2 years ago

When 4x2 + 7x - 5 is subtracted from 9x2 - 2x + 3, the result is

Mathematics

1 answer:

skelet666 [1.2K]2 years ago

3 0

The Awnser for the exact value is 7x + 3

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Find the inverse of this matrix.<br> 1 -1 -1<br> -1 2 3 <br> 1 1 4

zheka24 [161]

Let's use Gaussian elimination. Consider the augmented matrix,

$\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\-1 & 2 & 3 & 0 & 1 & 0\\1 & 1 & 4 & 0 & 0 & 1\end{array}\right]$

• Add row 1 to row 2, and add -1 (row 1) to row 3:

$\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 2 & 1 & 1 & 0\\0 & 2 & 5 & -1 & 0 & 1\end{array}\right]$

• Add -2 (row 2) to row 3:

$\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 2 & 1 & 1 & 0\\0 & 0 & 1 & -3 & -2 & 1\end{array}\right]$

• Add -2 (row 3) to row 2:

$\left[\begin{array}{ccc|ccc}1 & -1 & -1 & 1 & 0 & 0\\0 & 1 & 0 & 7 & 5 & -2\\0 & 0 & 1 & -3 & -2 & 1\end{array}\right]$

• Add row 2 and row 3 to row 1:

$\left[\begin{array}{ccc|ccc}1 & 0 & 0 & 5 & 3 & -1\\0 & 1 & 0 & 7 & 5 & -2\\0 & 0 & 1 & -3 & -2 & 1\end{array}\right]$

So the inverse is

$\begin{bmatrix}1&-1&-1\\-1&2&3\\1&1&4\end{bmatrix}^{-1} = \boxed{\begin{bmatrix}5&3&-1\\7&5&-2\\-3&-2&1\end{bmatrix}}$

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3 years ago

I need the answer for 6

Gnoma [55]

ME AGAIN!!! You should just let me do your homework from now on lol.

So, you have 4 red, 3 green and 1 yellow. Add all of those numbers together, you should get 8. How many green did you start with? You started with 3. So your answer is either 3:8, 3/8, or 3 to 8.

P.S: I can see the page fine. It isn't blurry. Hope that helped you!

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3 years ago

Mumz [18]

Answer:

Perpendicular, 1

Step-by-step explanation:

Parallel means the same slope

Perpendicular is the reciprocal and opposite sign

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The answer should be 9...

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3 years ago

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Musya8 [376]

Answer:

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Step-by-step explanation:

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2 years ago

When 4x2 + 7x - 5 is subtracted from 9x2 - 2x + 3, the result is​

When 4x2 + 7x - 5 is subtracted from 9x2 - 2x + 3, the result is