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3 years ago

Factored form of x^2-3x-4

Mathematics

2 answers:

Agata [3.3K]3 years ago

6 0

Answer:

x=4,x=-1

Step-by-step explanation:

x2-3x-4

To factorise we will need to get two numbers that when added it will give -3 and the same two numbers when multiplied it will give you-4

The two numbers involved is -4 and +1

x2-4x+x-4

Let's factorise

x(x-4)+1(x-4)

(x-4)(x+1)

x-4=0

Make x the subject of formula

x=4

x+1=0

Let's make x the subject of formula

x=-1

kolbaska11 [484]3 years ago

5 0

(x + 1) x (x - 4). When you check it you will get your original expression.

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3 years ago

Scores on a test are normally distributed with a mean of 81.2 and a standard deviation of 3.6. What is the probability of a rand

Misha Larkins [42]

Answer:

The probability of a randomly selected student scoring in between 77.6 and 88.4 is 0.8185.

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And a standard deviation of 3.6.

We have to find What is the probability of a randomly selected student scoring between 77.6 and 88.4?

For that we are going to subtract probability of getting more than 88.4 from probability of getting more than 77.6

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