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Sauron [17]
3 years ago
6

Use pascal triangle to expand and simplify (5x+4y)³​

Mathematics
1 answer:
Paul [167]3 years ago
3 0

Answer:

125x³+240xy²+64y³ +300yx²

Step-by-step explanation:

Row of pascals triangle to use is 1 3 3 1

For binomial expansion, use a³ +3a²b+3ab²+b³

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Find the approximate solution of this system of equations.
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The sum of 5x+y and (2xy + xy) is
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So monomial in most cases means “one”
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3 years ago
Find the real numbers x&y so that (x^2+2xy)+i(y-1) = (x^2-2x+2y) - i(x+y)​
Mkey [24]

In order for two complex numbers to be equal, their real and imaginary parts must match up.

So if

<em>x</em> ² + 2<em>xy</em> + <em>i</em> (<em>y</em> - 1) = <em>x</em> ² - 2<em>x</em> + 2<em>y</em> - <em>i</em> (<em>x</em> + <em>y</em>)

then

<em>x</em> ² + 2<em>xy</em> = <em>x</em> ² - 2<em>x</em> + 2<em>y</em>

and

<em>y</em> - 1 = -<em>x</em> - <em>y</em>

<em />

Solve for <em>x</em> and <em>y</em> : the first equation gives

<em>x</em> ² + 2<em>xy</em> = <em>x</em> ² - 2<em>x</em> + 2<em>y</em>

2<em>xy</em> = 2<em>y</em> - 2<em>x</em>

and the second gives

<em>y</em> - 1 = -<em>x</em> - <em>y</em>

2<em>y</em> = 1 - <em>x</em>

Substitute this into the first equation:

<em>x</em> (1 - <em>x</em>) = (1 - <em>x</em>) - 2<em>x</em>

<em>x</em> - <em>x</em> ² = 1 - 3<em>x</em>

<em>x</em> ² - 4<em>x</em> + 1 = 0

<em>x</em> = 2 ± √3

Then

<em>x</em> = 2 - √3   ==>   <em>y</em> = (-1 + √3)/2

<em>x</em> = 2 + √3   ==>   <em>y</em> = (-1 - √3)/2

both of which make both sides of the equation (2 - √3) + <em>i</em> (√3 - 3)/2.

3 0
3 years ago
. Suppose you plan to make a box that will hold exactly 40 one-inch cubes. Give the dimensions (ex: 1in x 1in x 40in) of 3 possi
stiks02 [169]

Answer:

The dimensions of the three possible boxes are;

Box 1:  2 inches length by 4 inches width by 5 inches height

Box 2:  2 inches length by 2 inches width by 10 inches height

Box 3:  8 inches length by 1 inch width by 5 inches height

Step-by-step explanation:

The dimensions of the required box = 40 in³

Therefore, a box that will hold all the cubes will have a dimension given as follows;

Length, l × Width, w × Height, h = 40 in.³

We therefore, look for possible dimensions of l, w, h, however to make is faster, we note that l × w = base area, BA, hence we look for the factors 40 thus;

BA × h        ≡  l × w × h

8  × 5 = 40 ≡ 2 × 4 × 5 = 40

4 × 10 = 40 ≡ 2 × 2 × 10 = 40

8 × 5 = 40 ≡ 8 × 1 × 5 = 40

Hence we have our three possible boxes as follows;

Box 1: Length = 2 inches, width = 4 inches and height = 5 inches

Box 2: Length = 2 inches, width = 2 inches and height = 10 inches

Box 3: Length = 8 inches, width = 1 inches and height = 5 inches.

4 0
3 years ago
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