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3 years ago

Which two perfect squares should be used to estimate ?

Mathematics

1 answer:

-Dominant- [34]3 years ago

6 0

Answer:

i think ur answer is a im not 100 percent sure let me know if im wrong

Step-by-step explanation:

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Solve the matrix equation by using inverse matrices.

STALIN [3.7K]

Answer:

x=-7, y=2

Step-by-step explanation:

You are given the matrix equation

$\left[\begin{array}{cc}2&-2\\-1&3\end{array}\right] \cdot \left[\begin{array}{c}x\\y\end{array}\right] = \left[\begin{array}{c}-18\\13\end{array}\right]$

Find the inverse matrix for the matrix

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

1. The determinant is

$\left|\left[\begin{array}{cc}2&-2\\-1&3\end{array}\right]\right|=2\cdot 3-(-1)\cdot (-2)=6-2=4$

$a_{11}=2 \Rightarrow A_{11}=3\\ \\a_{12}=-2 \Rightarrow A_{12}=-(-1)=1\\ \\a_{21}=-1 \Rightarrow A_{21}=-(-2)=2\\ \\a_{22}=3 \Rightarrow A_{22}=2$

3. Inverse matrix is

$\dfrac{1}{4}\left[\begin{array}{cc}3&1\\2&2\end{array}\right]^T=\dfrac{1}{4}\left[\begin{array}{cc}3&2\\1&2\end{array}\right]$

So, the solution of the equation is

$\left[\begin{array}{c}x\\y\end{array}\right]=\dfrac{1}{4}\left[\begin{array}{cc}3&2\\1&2\end{array}\right]\cdot \left[\begin{array}{c}-18\\13\end{array}\right]=\\ \\=\dfrac{1}{4}\left[\begin{array}{cc}3\cdot(-18)+2\cdot 13\\1\cdot (-18)+2\cdot 13\end{array}\right]=\dfrac{1}{4}\left[\begin{array}{c}-28\\8\end{array}\right]=\left[\begin{array}{c}-7\\2\end{array}\right]$

8 0

3 years ago

What is the solution set of 4x = y and 2x^2− y = 0?

Alona [7]

Answer:{0,2}

Step-by-step explanation:

Substitute 4x in for the y

2x^2-4x=0

Factor out GCF 2x

2x(x-2)=0

Set each factor = 0 and solve

2x=0 x=0 x-2=0 x=2

8 0

3 years ago

What is another way to write the time "quarter till 8"?

vesna_86 [32]

Answer:

7:45

Step-by-step explanation:

5 0

3 years ago

PLEASE HELP OMGGGGGGGG<br> also stan nct for clear skin :))))<br> ++no wreird link plssss

dolphi86 [110]

Answer:

its D

Step-by-step explanation:

C= n d

4 0

3 years ago

Please see photo above.

salantis [7]

Answer:

I dont f-n know

Step-by-step explanation:

3 0

3 years ago