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ale4655 [162]
3 years ago
10

Find two consecutive odd integers such that their product is 111 more than 3 times their sum​

Mathematics
1 answer:
ziro4ka [17]3 years ago
7 0

Answer:

The numbers are -9 and -7 or 13 and 15

Step-by-step explanation:

Let

x and x+2 ----> two consecutive odd integers

we know that

x(x+2)=3[x+x+2]+111  

Solve for x

x(x+2)=3[x+x+2]+111\\ \\x^{2}+2x=6x+6+111\\ \\x^{2}-4x-117=0

Solve the quadratic equation by graphing

The solution is x=-9, x=13

see the attached figure

<em>First solution</em>

x=-9

x+2=-9+2=-7

The numbers are -9 and -7

<em>Second solution</em>

x=13

x+2=13+2=15

The numbers are 13 and 15

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Factorise<br><br>a² - 144<br>Please factorise this​
charle [14.2K]

Answer:

  • \bf\pink{(a-12)\times (a+12)}

Step-by-step explanation:

<h2><u>Given Expression</u> :-</h2>

  • \bf\blue{a^{2} - 144}

<h2><u>Steps to factorise</u> :-</h2>

\longrightarrow\:\:\bf\red{a^{2} - 144}

  • Write the number in the exponential form with an exponent of 2

\longrightarrow\:\:\bf\orange{a^{2}-12^{2}}

  • Using a²-b² = (a-b)(a+b), factor the expression.

\longrightarrow\:\:\bf\purple{(a-12)\times (a+12)}

(<u>Refer the attachment for graph representation</u>)

<h2><u>Graph Details</u> :-</h2>

\bigstar\:\:\bf{y=a^{2}-144}

  • \rm{ Roots \:\:(-12,\:0)\:(12,\:0)}

  • \rm{Domain \:\:a \in {\mathbb{R}}}

  • \rm{Range \:\:y\in \bigg( -144,\:+\infty \bigg) }

  • \rm{Minimum \:\: (0,\:-144)}

  • \rm{Vertical\: Intercept\:\:(0,\:-144)}

4 0
3 years ago
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Fred paid $75 for a pack of 15 toy mice.<br><br><br> How much did each mouse cost?
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New Orleans, Louisiana, is 6 feet below sea level. The highest point in Louisiana, Driskill Mountain, is 541 feet higher than Ne
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Step-by-step explanation:

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A plane flies from atlanta to new york to los angeles angainst the wind in 5 hr the return trip back to atlanta with the wind on
dimulka [17.4K]

Answer: speed of plane is 720 km/h

Speed of wind is 80km/h

Step-by-step explanation:

Let x represent the speed of the plane.

Let y represent the speed of the wind.

The plane flies from Atlanta to los Angeles and against the wind in 5hrs and the distance between Atlanta and los Angeles is 3200 km.

Since it flew against the wind, the speed would be x-y km/hour

Distance = speed × time. Therefore

3200 = 5(x - y )

3200 = 5x - 5y - - - - - - - - - 1

the return trip back to Atlanta with the wind only 4 hr. This means that the speed is x+y km/hour. Therefore

3200 = 4(x+y)

3200 = 4x + 4y - - - - - - - - 2

Multiplying equation 1 by 4 and equation 2 by 5, it becomes

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Adding both equations, it becomes

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