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3 years ago

What is the sum? (3/x2-9) + (5/x+3)

Mathematics

2 answers:

vekshin13 years ago

8 0

Answer:

5x-12 / (x+3)(x-3)

Step-by-step explanation:

Given expression:\frac{3}{x^2-9}+\frac{5}{x+3}

Using identity a^2-b^2=(a+b)(a-b), we get

=\frac{3}{(x+3)(x-3)}+\frac{5}{x+3}

Taking L.C.M. of the denominator, we get

\frac{3+5(x-3)}{(x+3)(x-3)}=\frac{3+5x-15}{(x+3)(x-3)}

=\frac{5x-12}{(x+3)(x-3)}

\Rightarrow\frac{3}{x^2-9}+\frac{5}{x+3}=\frac{5x-12}{(x+3)(x-3)}

vladimir2022 [97]3 years ago

8 0

It’s (3/x2-9)+(5/x+3) go help me on my question!

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Hi can you help with some ratio and proportion questions

pochemuha

Answer:

1a. 12 : 40

1b. 15 : 21

1c. 24 : 44

1d. 2 : 25

2. 40 boys and 100 girls

3. 96 girls

4. £71.43

5a. 9 : 4

5b. 3 : 1

5c. 3 : 5

6. 210 : 90

7. Sorry, I couldn't figure out how to solve this question :(

Step-by-step explanation:

Since I'll be using a similar method to solve these questions, I won't go into a detailed explanation for how I solved every single question. If you do need extra help, please ask in the comments below my answer.

1. Let's use part (a) as an example. The ratio is 3:10. To new ratio is ?:40. So, 10 becomes 40. What number multiplied by 10 equals 40? The answer is 4. If 10 is multiplied by 4, then 3 must be multiplied by 4 as well. 3*4 = 12, so the ratio is 12:40.

In part b the ratio is multiplied by 3, part c is 4, and part d is 1/2.

2. To solve this, add the values on both sides of the ratio together: 2 + 5 = 7. Now, divide the total number of pupils, 140, by 7: 140/7 = 20. Finally, multiply 20 by both sides of the ratio: 2 * 20:5 * 20 = 40:100. There are 40 boys and 100 girls.

3. To solve this I used the same method as the one I used in question 1.

4. The ratio is 5:140, where 140 becomes 2000. To solve, use the method used in question 1.

5. Simplifying ratios is the same as simplifying fractions. Find the greatest common factor of the values on both sides of the ratio and divide both sides by that factor. For example, in part a the factor for 45:20 is 5. 45/5 = 9 and 20/5 = 4. The ratio becomes 9:4.

For part b the factor is 9 and for part c the factor is 50.

6. Same method as was used in question 2.

Hope this helps :)

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3 years ago

For both

Anuta_ua [19.1K]

Answer:

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Step-by-step explanation:

dx 8 dx exwdwf2f3f2ff3 3c3f3 ef

8 0

3 years ago

Having a hard time understanding these transformations. Thank you!

Oksanka [162]

Answer:

1). For < 4 Coordinates will be A"( -2,2),B"(1,-1),C"(-3,-2).

For 1 > Coordinates will be A"(3,2), B"(6,-1), C(2,-2).

2). A"(-2,2), B"(-1,-2), C"(-5,-1).

Step-by-step explanation:

1) In this part of the question we have to find the new coordinates of the triangle when there is a shift of 4 in left means the new coordinates will be A"( 2-4,2),B"(5-4,-1),C"(1-4,-2) Or A"( -2,2),B"(1,-1),C"(-3,-2).

And when shifted by 1 in right direction A,B,C will be A",B",C" that are A"( 2+1,2),B"(5+1,-1),C"(1+1,-2) Or A"(3,2), B"(6,-1), C(2,-2).

2) Now we have to get the reflection of points A(2,2), B(5,-1), C(1,-2) across Y axis.

When A reflects about Y axis it will reflect in Second quadrant. So new coordinates will be A"(-2,2).

Similarly B and C will reflect in third quadrant. So new coordinates will be B"(-1,-2) & C"(-5,-1).

8 0

3 years ago

What is the slope of the function?

AfilCa [17]

Change in y divided by the change in x

4 0

3 years ago

What is logs(4.7)+logs 2 written as a single log?