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3 years ago

X^2+18=0 solve please

Mathematics

1 answer:

diamong [38]3 years ago

3 0

9514 1404 393

Answer:

x = ±3√2i

Step-by-step explanation:

Add -18 to both sides of the equation:

x^2 = -18

Take the square root of both sides:

x = ±√(-18)

Remember that 18=9·2 = (3^2)·2 and √-1 = i. Simplify.

x = ±(√(3^2))·(√2)·(√-1)

x = ±3√2i

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3 years ago

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kirza4 [7]

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3 years ago

Given P(A and B) 0.20, P(A) 0.49, and P(B) = 0.41 are events A and B independent or dependent? 1) Dependent 2) Independent

blsea [12.9K]

Answer: The correct option is (1) Dependent.

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P(A ∩ B) = 0.20, P(A) = 0.49 and P(B) = 0.41.

We are to check whether the events A and B are independent or dependent.

We know that

the two events C and D are said to be independent if the probabilities of their intersection is equal to the product of their probabilities.

That is, P(C ∩ D) = P(C) × P(D).

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4 years ago

A math class has a total of 36 students. The number of females is 10 less than the number of males. How many males and how many

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3 years ago

10x + 2 y = 24 -5 x + y = -18

wlad13 [49]

Answer:

(3,-3)

Step-by-step explanation:

First you divide 2 out of the first equation and it turns into 5x+y=12.

Then you write one on top of the other so you can add them. It looks like:

5x + y = 12

-5x + y = -18

Then you add them together and the 5x's cancel each other out and you are left with 2y = -6

So then you divide both sides by 2 and get y = -3

Then you plug -3 into the second equation because it is simpler and get -5x - 3 = -18

So then you add three to both sides and get -5x = -15

And finally you divide both sides by -5 and get x=3

6 0

4 years ago