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ryzh [129]
3 years ago
11

X²-4 this is the difference of square help please

Mathematics
1 answer:
fenix001 [56]3 years ago
3 0

Answer:

(x - 2)(x + 2)

Step-by-step explanation:

If this is a difference of squares, it factors like this.

(x - 2)(x + 2)

The general rule is x^2 - a^2 factors into sqrt(x^2) +/- sqrt(a^2)

That always produces 2 factors: (x + a)(x - a)

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Find the values of x and y.
Elis [28]

Answer:

Option A

x=6 , y=9

Step-by-step explanation:

As we can see in the figure that point T is the mid point of rectangle and there are two diagonals QS and PR

So in basic geometry we know that the length of the diagonal from the mid point i.e. Taking the diagonal QS the length of QT and TS would be equal because they are same diagonal which is cut into two parts by point T

Similarly the Length of RT and the length of TP would be same

From all this we deduct that

3x = 2y              ..................(i)

and

y + 3 = 2x           ................(ii)

From equation (i)

3x = 2y

Dividing both sides by 3 the equation becomes

x= \frac{2y}{3}                ....................(iii)

Putting this value in equation (ii)

y + 3 = 2(\frac{2y}{3})

y+3 =\frac{4y}{3}

multiplying both sides by 3

3(y+3)=\frac{4y*3}{3}

the equation becomes

3y+9=4y

subtracting 3y from both sides

3y-3y+9=4y-3y

y=9

Putting the value of y in equation (iii)

x= \frac{2*9}{3}

solving it

x= \frac{18}{3}

x=6

so x=6 and y=9 is answer which is option A


   

5 0
3 years ago
An airplane’s altitude changed − 378 feet over 7 minutes. What was the mean change of altitude in feet per minute?
prohojiy [21]
The mean would be -92.75 due to the fact that -378 feet/7 minutes would equal the unit ratio of  -92.75 feet/ 1minute or a mean of -92.75
6 0
3 years ago
What is the length of a kite string that is 6 meters above and 9 meters away from where it is being held? Round to the nearest t
ivann1987 [24]

Answer:

10.8 meters

Step-by-step explanation:

This situation forms a right triangle, where the length of the kite string is the hypotenuse, the distance from where it is held is the long leg, and the height is the short leg.

Use the pythagorean theorem to solve for c, the length of the kite string.

a² + b² = c²

6² + 9² = c²

36 + 81 = c²

117 = c²

10.8 = c

So, the length of the kite string is 10.8 meters

7 0
3 years ago
Jane does a total of 75 push-ups each week. How many push-ups will Jane do in the 12 weeks? (Show your work).
dedylja [7]

Answer:

900 push-ups

Step-by-step explanation:

75 push-ups in one week

In 12 weeks = 75 × 12 = 900 push-ups

<em>PLEASE DO</em><em> </em><em>MARK ME</em><em> </em><em>AS BRAINLIEST</em><em> </em><em>IF MY</em><em> </em><em>ANSWER IS</em><em> </em><em>HELPFUL</em><em> </em><em>:</em><em>)</em><em> </em>

7 0
3 years ago
Guys, I’m giving you 81 points for you to answer to my last 2 weeks of my math word problem homework from The Hung Vuong Learnin
hammer [34]

Answer:

8.50x+2y

Step-by-step explanation:

Let x represent the time she works (in hours) and y represent the amount of membership she sells then...

8.50x+2y

This is because she is paid $8.50 per hour and she works x hours. She is also paid $2 for each y number of memberships she sells.

4 0
3 years ago
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