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4 years ago

Factorise: 2x² - x - 3

Mathematics

2 answers:

Lemur [1.5K]4 years ago

5 0

Step-by-step explanation:

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andre [41]4 years ago

3 0

Answer:

(2x-3)(x+1)

Step-by-step explanation:

2x²-x-3

(2x-3)(x+1)

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9x-9=27 help me with this

Ray Of Light [21]

Answer:

x=4

Step-by-step explanation:

9x-9=27

Add 9 to each side

9x-9+9=27+9

9x = 36

Divide by 9

9x/9 = 36/9

x = 4

8 0

3 years ago

Read 2 more answers

Kristian and Stephanie share money in the ratio 3 :2 Kristian receives $72 How much will Stephanie receive

koban [17]

Answer:

Step-by-step explanation:

Kristian : Stephanie

3 2

Kristian receives 72

72/3 = 24

Multiply each side by 24

Kristian : Stephanie

3*24 2*24

72 48

3 0

3 years ago

PLease help me. YOu'll get 10 points.\

nevsk [136]

Answer:

Option D is your answer . If I'm right so,

Please mark me as brainliest. thanks!!!

7 0

3 years ago

A probability distribution for a random variable Y is given by P(Y=y)=cy, for y=1,2,4,5 and c is a constant. Find E(Y), the expe

Dahasolnce [82]

Answer:

$c(1+2+4+5) =1$

$c =\frac{1}{12}$

Now we can find the expected value with this formula:

$E(Y) =\sum_{i=1}^n Y_i P(Y_i) =\sum_{i=1}^n cy_i *y_i = cy^2_i$

And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

Step-by-step explanation:

For this case we know the following probability mass function given:

$P(y) = cy , y= 1,2,4,5$

For this case we need to satisfy the following condition in order to have a probability distribution function:

$\sum_{i=1}^n P(y_i) =1$

And we have this:

$c(1+2+4+5) =1$

$c =\frac{1}{12}$

Now we can find the expected value with this formula:

$E(Y) =\sum_{i=1}^n Y_i P(Y_i) =\sum_{i=1}^n cy_i *y_i = cy^2_i$

And replacing we got:

$E(Y) = \frac{1}{12} (1^2 + 2^2 + 4^2 +5^2) = \frac{46}{12}= \frac{23}{6}$

6 0

3 years ago

How do I factor quadratics?

nekit [7.7K]

Ok so factoring quadratics is fairly easy once you get the hang of it

So we have a quadratic $x^2+x-2$

My first question would be what 2 numbers multiply to -2 and add to +1

the answer is 2 and -1

Second question what 2 values multiply to get $x^2$

the answer x and x

your factored form would be $(x-1)(x+2)$

This is as far as i can explain there is a whole lot about quadratics to be learned. You have to ask your teacher on more information

6 0

4 years ago

Factorise: 2x² - x - 3​

Factorise: 2x² - x - 3