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kodGreya [7K]
3 years ago
11

Please helpppp!!! Solve: x^2 - 4x-5=0

Mathematics
1 answer:
PtichkaEL [24]3 years ago
4 0

Answer:

x=-1,5

Step-by-step explanation:

x^2-4x-5=0

In order to solve this quadratic, we have many methods. We can factor, complete the square, or use the quadratic formula. I'm going to factor since it's the easiest method.

To factor, find two numbers that when multiplied equal a(c) and when added equal b.

a=1, b=-4, and c=-5.

So we want two numbers that when multiplied equals 1(-5)=-5 and when added equals -4.

-5 and 1 are the possible numbers. Therefore:

x^2-4x-5=0\\x^2+x-5x-5=0\\x(x+1)-5(x+1)=0\\(x-5)(x+1)=0\\x=5, -1

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Solve for x: -3(4x+3)+4(6x+1)=43
mezya [45]

Answer:

x=4

Step-by-step explanation:

-3(4x+3)+4(6x+1)=43

distribute the -3 and 4

-12x-9+24x+4=43

combine like terms

12x-5=43

add 5 on both sides

12x=48

divide 12 on both sides

x=4

4 0
3 years ago
In a data set with a normal distribution, the mean is 59 and the standard deviation is 3.
Delicious77 [7]

Answer:

Part A: 81.5%

Part B: About 95% of the data lie between 53 and 65.

Step-by-step explanation:

Note: the percentages marked in red and blue never change

For Part A, we add the percentages that are between 53 and 62. So, 34% + 34% + 13.5% which is 81.5%

For Part B, we can look at this graph and seen that 95% of this data set lies between 53 and 65

Hope this is correct and of help!

4 0
2 years ago
What are the zeros of f(x) = x^2 - 12x+ 36
yuradex [85]

Answer:

x = 6

Step-by-step explanation:

0 = x^2 -12x + 36      solve by factoring ...or Quadratic Formula

0 = ( x-6)(x-6)       shows zeroes ( both of them) are x = 6

4 0
2 years ago
What is the probability of rolling a number less than six on a number cube?
Kipish [7]
Likely

There are six outcomes 1, 2, 3, 4, 5, and 6
Numbers less than 6, are 1, 2, 3, 4, and 5, so the chance to roll a number less than 6 is 5/6 which has a probability of likely as there are more chances to roll a number less than six
6 0
2 years ago
Read 2 more answers
Please answer, I don't know because I'm not the smartest.
Eva8 [605]

Answer:

9 * l = 54

Step-by-step explanation:

You don't need to worry because you are not the smartest, everyone are different, some concepts might be difficult, but will become easy soon....

Here is the answer to your question,

area of a rectangle = length * width

( * = multiplication symbol, specifying as many feel confused )

A = l * w

Here..... A = 54 m², w = 9m

54 = l * 9  or...

9 * l = 54

7 0
3 years ago
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