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3 years ago

Plz Help. write as polynomial-a²(3a-5)+4a(a²-a)

Mathematics

1 answer:

Genrish500 [490]3 years ago

3 0

Answer:

a^3 + a^2

Step-by-step explanation:

Distribute the term left of each set of parentheses, then combine like terms.

-a²(3a - 5) + 4a(a² - a) =

= -3a^3 + 5a^2 + 4a^3 - 4a^2

= a^3 + a^2

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Answer:

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Step-by-step explanation:

First, we must know the equations given:

2x + 3y = 1
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Following Crammer's Rule, we have the matrix form:

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Now we solve using the determinants:

$x=\frac{\left[\begin{array}{ccc}1&3\\5&1\end{array}\right]}{\left[\begin{array}{ccc}2&3\\3&1\end{array}\right] } =\frac{(1*1)-(5*3)}{(2*1)-(3*3)} = \frac{1-15}{2-9} =\frac{-14}{-7} = 2$

$y=\frac{\left[\begin{array}{ccc}2&1\\3&5\end{array}\right]}{\left[\begin{array}{ccc}2&3\\3&1\end{array}\right] } =\frac{(2*5)-(3*1)}{(2*1)-(3*3)}=\frac{10-3}{2-9} =\frac{7}{-7}=-1$

Now, we can find the answer which is x= 2 and y= -1, we can replace these values in the equation to confirm the results are right, with the first equation:

2x + 3y = 1
2(2) + 3(-1)= 1
4 - 3 = 1
1 = 1

And, with the second equation:

3x + y = 5
3(2) + (-1) = 5
6 - 1 = 5
5 = 5

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3 years ago

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3 years ago

Plz Help. write as polynomial-a²(3a-5)+4a(a²-a)​

Plz Help. write as polynomial-a²(3a-5)+4a(a²-a)