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3 years ago

Find 3 numbers in GP whose sum is 28 and product is 512

Mathematics

1 answer:

SVETLANKA909090 [29]3 years ago

3 0

Answer:

Let the three numbers be a,ar, ar^2 ,

where r is the common ratio.

⇒a+ar+ar^2 =28 and a^3 r^3 =512

⇒ar=8⇒a+ar^2 =20

⇒8r^2 −20r+8=0

⇒r=2,r= 1/2

If r=2,a=4

Therefore, the three numbers are 4,8,16.

Step-by-step explanation:

Hope it is helpful.....

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Solve algebraically for x:3(x+1)-5x=12-(6x-7)

xeze [42]

Answer:

x=4

Step-by-step explanation:

3(x+1)-5x=12-(6x-7)

3x+3-5x= 12-6x+7

-2x+3=19-6x

-2x+6x=4x

19-3=16

4x=16

16/4=4

x=4

7 0

3 years ago

This graph represents a quadratic function. What is the function’s equation written in factored form and in vertex form?

creativ13 [48]

Answer:

Part a) The function’s equation written in vertex form is

$f(x)=2(x-2)^2-8$

Part b) The function’s equation written in factored form is equal to

$f(x)=2x(x-4)$

Step-by-step explanation:

Part a) What is the function’s equation written in vertex form?

we know that

The equation of a vertical parabola written in vertex form is equal to

$f(x)=a(x-h)^2+k$

where

a is a coefficient

(h,k) is the vertex

Looking at the graph

The vertex is the point (2,-8)

substitute

$f(x)=a(x-2)^2-8$

Find the value of the coefficient a

take one point from the graph

(0,0)

substitute in the equation

$0=a(0-2)^2-8\\0=4a-8\\4a=8\\a=2$

therefore

The function’s equation written in vertex form is

$f(x)=2(x-2)^2-8$

Part b) What is the function’s equation written in factored form?

we know that

The equation of a vertical parabola written in factored form is equal to

$f(x)=a(x-x_1)(x-x_2)$

where

a is a coefficient

x_1 and x_2 are the zeros or x-intercepts of the function

Remember that the x-intercept is the value of x when the value of the function is equal to zero

Looking at the graph

The zeros or x-intercepts of the function are

x=0 and x=4

$f(x)=a(x-0)(x-4)$

$f(x)=ax(x-4)$

Find the value of the coefficient a

take one point from the graph

(2,-8)

substitute

$-8=a(2)(2-4)\\-8=-4a\\a=2$

therefore

The function’s equation written in factored form is equal to

$f(x)=2x(x-4)$

4 0

4 years ago

the library, post office, and gas station are all on elm street. the library is three miles west of the post office. the gas sta

Paha777 [63]

Answer:

distance apart= 9 miles

Step-by-step explanation:

The library , post office and gas station are all on elm street. The library is 3 miles away westward of the post office. The gas station is also 6 miles east of the post office. The distance between the library and the gas station can be computed below.

The post office is located at the middle between the library and the gas station. The library goes 3 miles westward of the post office while the gas station goes 6 miles eastward of the post office. The distance apart between the library and the gas station is the sum of the distance of the gas station from the post office and the distance of the library from the post office .

Therefore,

6miles + 3 miles = 9 miles

7 0

3 years ago

Help meeeeeee pls yes indeed

morpeh [17]

Answer:

Step-by-step explanation:

5 1/4=21/4, 21/4÷3/4=7

4 0

3 years ago

Read 2 more answers

Pls I need help now pls help me

VARVARA [1.3K]

1. yes

2. yes

3. no

4. yes

5. yes

7 0

3 years ago

Read 2 more answers

Find 3 numbers in GP whose sum is 28 and product is 512​

Find 3 numbers in GP whose sum is 28 and product is 512