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3 years ago

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

Mathematics

2 answers:

ValentinkaMS [17]3 years ago

8 0

Answer:

x = -5/2

Step-by-step explanation:

anastassius [24]3 years ago

5 0

x=-5/2

First, to solve this I’m going to multiply (x+3)(x+4) and (x+1)(x+2).

You get x^2 + 7x + 12 = x^2 + 3x + 2

I want to get x on only one side so I subtract
x^2+3x+2

4x+10=0

I subtract 10 from both sides
4x=-10

Then divide each side by 4
x=-5/2

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slava [35]

Answer:

The age of the person who entered the room is 15

Step-by-step explanation:

We are given:

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17, 16, 15, 17, 22

A person enters room, and then the mean age of 6 people is 17.

We need to find the age of person who entered the room.

The formula to calculate mean is: $Mean=\frac{Sum\:of\:all\:data\:values}{Number\:of\:data\:Values}$

Now, in question we are given mean of 6 people that is 17

The age of 5 people are given while age of one person who enters the room is unknown.

Let age of person whose age is unknown= x

Now finding x using mean formula

$Mean=\frac{Sum\:of\:all\:data\:values}{Number\:of\:data\:Values}\\17=\frac{17+16+ 15+ 17+ 22+x}{6}\\17=\frac{87+x}{6}\\17*6=87+x\\102=87+x\\x=102-87\\x=15$

So, The value of x: x=15

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