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motikmotik
2 years ago
10

SECTION B: LOGARITHMS A Question Three: Solve the equation log₂ (4x² - 9).- log₂ (2x + 3) = 3. Hint: (4x² - 9) is a difference o

f two squares.​
Mathematics
2 answers:
lorasvet [3.4K]2 years ago
5 0

Answer:

x = 11/2

Step-by-step explanation:

Use rules for logarithms to write it as a single log. Then use the hint to simplify further. Change it to exponential form to solve. See image.

Shalnov [3]2 years ago
3 0

Answer: 2x+3

Step-by-step explanation: Simplify   ———————

           2x - 3

Trying to factor as a Difference of Squares:

2.1      Factoring:  4x2 - 9

Theory : A difference of two perfect squares,  A2 - B2  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =

        A2 - AB + BA - B2 =

        A2 - AB + AB - B2 =

        A2 - B2

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check :  4  is the square of  2

Check : 9 is the square of 3

Check :  x2  is the square of  x1

Factorization is :       (2x + 3)  •  (2x - 3)

Canceling Out :

2.2    Cancel out  (2x - 3)  which appears on both sides of the fraction line.

Final result :

 2x + 3

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A car travels 500 miles at an average speed of 60 MPH on the return trip the same route that it travels 50 miles per hour how lo
xxMikexx [17]

Step-by-step explanation:

it is not clear - is 500 miles the whole round trip, or is it only the trip in one direction ?

and do we need the time for the whole round trip, or only for the return trip ?

in any case, always remember,

speed = distance/time

therefore, to get time, we need to divide distance by speed :

distance / distance/time = time×distance/distance = time

so, let's calculate all these different scenarios :

1. 500 miles is only one direction, and we measure only the time going back with 60 mph :

500 / 60 = 50/6 = 25/3 = 8 1/3 = 8 hours 20 minutes.

as 1/3 of 1 hour = 1/3 of 60 minutes = 60/3 = 20 minutes.

2. 500 miles is only one direction (going 1000 miles altogether), and we measure the time going to with 50 mph and going back with 60 mph :

500 / 50 = 10 hours

500 / 60 = 8 hours 20 minutes

the whole round trip takes 18 hours 20 minutes.

3. 500 miles is the whole round trip. so, 250 miles is one direction. and we measure only the time going back with 60 mph :

250 / 60 = 25/6 = 4 1/6 = 4 hours 10 minutes.

as 1/6 of 1 hour = 1/6 of 60 minutes = 60/6 = 10 minutes.

4. 500 miles is the whole round trip. so, 250 miles is one direction. and we measure the time going to with 50 mph and back with 60 mph :

250 / 50 = 5 hours

250 / 60 = 4 hours 10 minutes

the whole round trip takes 9 hours 10 minutes.

did you notice ?

when going only half the distance, also the time it takes to travel that distance is only half (or vice versa - double). because the ratio distance/time is always the same.

7 0
2 years ago
What are the coefficients in the problem: 392 + 4x - 5y + x
vovangra [49]

Answer:

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Step-by-step explanation:

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4 0
2 years ago
If the maker of the promissory note fails to pay the note on the due date,the note is said to be
Svetlanka [38]

Answer:

When the maker of a promissory note fails to pay, the note is said to be <u>dishonored.</u>

Step-by-step explanation:

5 0
3 years ago
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Tanya [424]

Answer:

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Step-by-step explanation:

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8 0
3 years ago
How do I solve this problem, or can I have an answer to this problem?
azamat
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7 0
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