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zaharov [31]
3 years ago
14

Tích các nghiệm của phương trình Log(x-1)²=2 là

Mathematics
1 answer:
NeTakaya3 years ago
5 0

Answer:

-99

Step-by-step explanation:

Log(x-1)²=2

Log(x-1)²=Log(100)

(x-1)²=100

x-1=10 and x-1=-10

x₁=11     and x₂=-9

x₁ × x₂ = 11 × (-9) = -99

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A month of the year is chosen at random. What is the probability that the month starts with the letter Jor the letter M?
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Answer:

5 out of 12

5/12

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There are three months whose name starts with the letter 'j': January, June, July

There are two months whose name starts with the letter 'm': March, May

So altogether, there are 5 months whose name starts with the letter 'j' or 'm'. So the possible outcome is 5 and total number of sample space is 12.

Therefore the required probability is: 5/12

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Find the equation of locus of a point which moves such that its distance from (0,2) is one third distance from (-2,3). ( I WILL
scoray [572]

Answer:

8(x^2+y^2)-4x-30y+23=0

Step-by-step explanation:

<u />

<u>Distance formula</u>

\sqrt{(x_2-x_1)^2+(y_2-y_1)^2}

Let P(x, y) = any point on the locus

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\implies x^2+(y-2)^2=\dfrac{1}{9}[(x+2)^2+(y-3)^2]

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2 years ago
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