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postnew [5]
4 years ago
15

(1+2i) (2+5i)

Mathematics
1 answer:
Lostsunrise [7]4 years ago
5 0

Answer:

Step-by-step explanation:

first multiply 1 with 2+5i then multiply 2i with 2+5i and you will get

2+5i+4i+10i^2

then in the next step add 4i and 5i you will get 9i

in the next step put i^2=-1 and you will get -10

in the last step just substract 2-10 you will get -8 and 9i

and your answer will be -8+9i

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Can you help me 2x+3y-x-(8+1)?
professor190 [17]

Answer: x+3y−9

Step-by-step explanation:

Simplify the expression.

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8 0
3 years ago
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What is the discriminant of the quadratic equation 9x2 – X – 8=0?
goldfiish [28.3K]

Answer:

288

Step-by-step explanation:

a = 9

b = -1

c = -8

b^2 * -4 * ( a * c )

Just filing in the numbers given above:

-1^2 * -4 * ( 9 * -8 )

1 * -4 * ( -72)

1 * + 288 = 288

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3 years ago
There is 1 red gumdrop and 4 green gumdrops in a small jar. Also, 2 pieces of butterscotch candy and 3 pieces of cinnamon
victus00 [196]

Answer:

The probability that he will get a red gumdrop and a piece of butterscotch candy is 2/25

Step-by-step explanation:

The path to find the answer is to find the probability of both things happening  and then multiply them. First, there is 1 red gumdrop and 4 green gumdrops in a jar. There are 5 gumdrops total so the probability of choosing a red one is 1/5. Next, there are 2 pieces of butterscotch candy and 3 pieces of cinnamon candy in another jar. There are 5 pieces of candy total so the probability of choosing a piece of butterscotch candy is 2/5. Finally multiply the two probabilities: 1/5 * 2/5 = <u>2/25.</u>

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likoan [24]

Answer:

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8 0
3 years ago
Which relation is a direct variation that contains the ordered pair (2, 7)? y = 4x – 1 y = StartFraction 7 Over x EndFraction y
Vanyuwa [196]

Answer:

The relation y=\frac{7}{2}x or y = seven-halves x is a direct variation that contains the ordered pair (2,7).

Step-by-step explanation:

Given:

The ordered pair = (2, 7).

Now, to get the direct variation:

As (2,7) lies on it.

So, direct variation means y=kx.

x=2.

y=7.

Now,

y=kx

7=k\times 2

\frac{7}{2} =k

k=\frac{7}{2}

Now, to get the direct variation:

y=kx

y=\frac{7}{2}x

y=\frac{7}{2}x or y = seven-halves x.

Therefore, the relation y=\frac{7}{2}x or y = seven-halves x is a direct variation that contains the ordered pair (2,7).

6 0
4 years ago
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