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lbvjy [14]
3 years ago
9

Please help me with this question I really need help!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Mathematics
1 answer:
Alinara [238K]3 years ago
6 0

Answer:

Step-by-step explanation:

The angles of a triangle add up to 180°.

∠4 = 180°-35°-90° = 55°

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A= [1, 3; 2, 1], B=[3, 6; -1, 1]. Find AB & BA if possible
steposvetlana [31]

Answer:

AB\Rightarrow \quad \begin{bmatrix}0 & 9\\ 5 & 13\end{bmatrix}\\BA\Rightarrow \quad \begin{bmatrix}15 & 15\\ 1 & -2\end{bmatrix}

Step-by-step explanation:

For two matrix P and Q, the product, say PQ is defined when:

The number of columns of P = The number of rows of Q

Since A is a 2×2 matrix and B is also a 2×2 matrix

Thus both AB and BA are possible.

So AB is:

AB\Rightarrow\begin{bmatrix}1 & 3\\ 2 & 1\end{bmatrix}\begin{bmatrix}3 & 6\\ -1 & 1\end{bmatrix}\\AB\Rightarrow\quad \begin{bmatrix}3\times 1+3\times (-1) & 6\times 1+3\times 1\\3\times 2+1\times (-1) & 6\times 2+1\times 1\end{bmatrix}\\AB\Rightarrow \quad \begin{bmatrix}0 & 9\\ 5 & 13\end{bmatrix}

BA is:

BA\Rightarrow\begin{bmatrix}3 & 6\\ -1 & 1\end{bmatrix}\begin{bmatrix}1 & 3\\ 2 & 1\end{bmatrix}\\BA\Rightarrow\quad \begin{bmatrix}3\times 1+6\times 2 & 3\times 3+6\times 1\\(-1)\times 1+1\times 2 & (-1)\times 3+1\times 1\end{bmatrix}\\BA\Rightarrow \quad \begin{bmatrix}15 & 15\\ 1 & -2\end{bmatrix}

8 0
3 years ago
What are the roots of the equation 5x^2=-9x-6n simplest a+bi form?
iVinArrow [24]
5 square root of 2 is 25.
-9-6 is -15
4 0
3 years ago
Which expressions are equivalent to the one below? Check all that apply.
Paraphin [41]

Answer:

log (1/3)

Step-by-step explanation:

log  \: 2 - log \: 6 \\  \\  = log \frac{2}{6}  \\  \\  = log \frac{1}{3}

5 0
2 years ago
Hi please help thank you i’ll give brainliest
Sergio [31]

Answer:

ok so first start with 97 and 45 put together 57/97 and

Step-by-step explanation:

4 0
3 years ago
The quotient of a number and 2 is larger than 3
Lostsunrise [7]
There are many for this ,but one sample is: 2 divided by 2is 4 X 3 which is 12.
8 0
3 years ago
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