3 years ago

Factorise completely: 1. 3xy - x2. 4a² - 9

Mathematics

1 answer:

Amanda [17]3 years ago

6 0

Answer:

x(3y - 1) and (2a - 3)(2a + 3)

Step-by-step explanation:

(1)

3xy - x ← factor out x from each term

= x(3y - 1)

(2)

4a² - 9 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , then

4a² - 9

= (2a)² - 3²

= (2a - 3)(2a + 3)

You might be interested in

Please help the question is in the picture I linked to the question

il63 [147K]

Answer:

$\frac{10a+300}{200}$

Step-by-step explanation:

1. take 10 times a and get 10a and put in the numerator spot of your answer

2. then do 15 times 20 which is 300 so add 300 to 10a in the numerator spot of your answer

3. multiple 20 times 10 which is 200 and make it your denominator of your answer

This method is called the butterfly method

8 0

3 years ago

What is the equation of the line that passes through (4, 3) and (-4, -1)?

snow_lady [41]

It should be y=1/2x+1

3 0

3 years ago

Help please I really need help

defon

Step-by-step explanation:

your answer is

248 × 22 = 5456

8 0

3 years ago

Read 2 more answers

Use multiplication to find three ratios equivalent to 8:12

tatyana61 [14]

Ok so 8:12 can be 8 to 12, or 8\12

do that help?

4 0

3 years ago

Read 2 more answers

How do you write 200 trillion in scientific notation?

ratelena [41]

You can use either of these, depending on your teacher.
2.e+14
2.0*10^14

6 0

3 years ago

Factorise completely: 1. 3xy - x2. 4a² - 9​

Factorise completely: 1. 3xy - x2. 4a² - 9