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3 years ago

7

(3n-1)(3n+2)...anyone know this?...

2 answers:

Alona [7]3 years ago

3 0

The answer to this question is 9n^2+3n-2. We expand this polynomial factored with the distributive property
(3n-1)(3n+2) = 3n(3n-1)+2(3n-1) = 9n^2 - 3n + 6n - 2 = 9n^2 + 3n - 2

4vir4ik [10]3 years ago

3 0

The first step for solving this expression is to multiply each term in the first parenthesis by each term in the second parenthesis (FOIL method)
3n × 3n + 3n × 2 - 3n - 2
Calculate the product of the first two numbers.
9n² + 3n × 2 - 3n - 2
Calculate the product of the next set of multiplication.
9n² + 6n - 3n - 2
Collect the like terms that have a variable of n to get your final answer.
9n² + 3n - 2
This means that the correct answer to your question is going to be 9n² + 3n - 2.
Let me know if you have any further questions.
:)

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3 years ago

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arlik [135]

Given:

In a right angle triangle θ is an acute angle and $\tan\theta =\dfrac{3}{5}$ .

To find:

The value of $\cos \theta$ .

Solution:

In a right angle triangle,

$\tan \theta=\dfrac{Perpendicular}{Base}$

We have,

$\tan\theta =\dfrac{3}{5}$

It means the ratio of perpendicular to base is 3:5. Let 3x be the perpendicular and 5x be the base.

By using Pythagoras theorem,

$Hypotenuse=\sqrt{Perpendicular^2+base^2}$

$Hypotenuse=\sqrt{(3x)^2+(5x)^2}$

$Hypotenuse=\sqrt{9x^2+25x^2}$

$Hypotenuse=\sqrt{34x^2}$

$Hypotenuse=x\sqrt{34}$

In a right angle triangle,

$\cos \theta=\dfrac{Base}{Hypotenuse}$

$\cos \theta=\dfrac{5x}{x\sqrt{34}}$

$\cos \theta=\dfrac{5}{\sqrt{34}}$

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2 years ago

A number added to 3 is equal to negative 5, find the number

anzhelika [568]

Answer:

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Step-by-step explanation:

An equation at represents this situation is:

-5 = 3 + x

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-5 - 3 = -8

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steposvetlana [31]

Answer:

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Step-by-step explanation:

1 chain = 66 feet

Length ( l ) = 66 feet

Breadth ( b ) = 10 feet

To find :

The area of a cricket pitch in square feet = ?

The area of a cricket pitch in square feet will be in the shape of rectangle.

Formula : -

Area of a rectangle = lb

Area of a rectangle

= 66 x 10

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Therefore,

660 square feet is the area of a cricket pitch.

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2 years ago