3 years ago

X^2+1/x^2=18 find x-1/x

Mathematics

1 answer:

MAVERICK [17]3 years ago

4 0

Notice that

$\left(x-\dfrac1x\right)^2=x^2-2+\dfrac1{x^2}=18-2=16$

which tells us

$x-\dfrac1x=\pm4$

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HELP ASAP

Alexxandr [17]

Answer: A − 9/7

Step-by-step explanation:

Hi, to answer this question we have to convert all the numbers into decimal form.

-3 1/3 = - (3x3+1)/3 =-10/3 = - 3.3334

-4/5 = -0.8

Since he number must greater than −3 1/3 but less than − 4/5.

−3 1/3 < x < − 4/5.

- 3.3334 < x < -0.8

The correct option is A = -9/7 , because in decimal form is equal to -1.28-

- 3.3334 < -1.28 < -0.8

5 0

3 years ago

What’s the equation to convert 100 inches per minute to feet per hour

laiz [17]

Let's look at each part of the equation. We need to first convert the inches to feet then multiply it by 60 to get per hour.
To convert inches to feet, we need to divide by 12.
100÷12
8 1/3
We need to then multiply it by 60 to find per hour.
8 1/3×60= 500
Let's put the equation together, we'll need parenthesis.
$( \frac{100}{12} )*60=500$

4 0

3 years ago

micchel and jennefer each worked 25 hours last week. micchel eared $10 per hour jennifer earned $12 per hour how much more did j

Mila [183]

Answer:Jennifer earn 50$ more than micchel

Step-by-step explanation: