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Anni [7]
3 years ago
13

Can anyone explain how to factor quadratics? i have a whole page of stuff like the picture.

Mathematics
1 answer:
finlep [7]3 years ago
3 0

Answer:

7) (s + 2)(s + 5)

   s = -2, -5

8) (x + 7)(x + 4)

   x = -7, -4

9) (d - 3)(d + 9)

    d = 3, -9

Step-by-step explanation:

To start you will want to try and look for two numbers that multiply to equal a*c and have a sum equal to b. So with number 7, a=1 b=7 and c=10. We need to find two numbers that multiply to equal 1*10 and add to equal 7. so the numbers 5 & 2 work perfectly. 5*2 = 10 and 5+2 = 7. so now we will split up the 7s into 5s+2s.

s^2 + 5s + 2s + 10

The next step would be to group each side together. Using parentheses will help keep us organized.

(s^2 + 5s)(2s + 10)

So now it's time to factor something out of each side. You are going to work on one side at a time and find something that the two have in common. so starting with (s^2 + 5s), we can see that the s^2 and the 5s both have an s in common, so we can go ahead and factor that out.

s(s + 5)

Now with the (2s + 10), we can see that you can easily divide a 2 from both sides.

2(s + 5)

So now if we reassemble to two parts we would have something that looks like this.

s(s + 5) + 2(s + 5)

So now, the numbers/variables that we factored out, s & 2, would be put together in their own parentheses and the two (s + 5)s can be combined into their own set of parentheses. This would look something like this:

(s + 2)(s + 5)

Now this is your fully factored form, if you wanted to take it a step further and solve the equation you could take each side and set it equal to 0 and solve for your s.

s + 2 = 0

s = -2

&

s + 5 = 0

s = -5

7) s^2 + 7s + 10

   s^2 + 5s + 2s + 10

   (s^2 + 5s) + (2s + 10)

   s(s + 5) + 2(s + 5)

   (s + 2)(s + 5)

   s = -2, -5

8) x^2 + 11x + 28

   x^2 + 4x + 7x + 28

   (x^2 + 4x) + (7x +28)

   x(x + 4) + 7(x + 4)

   (x + 7)(x + 4)

   x = -7, -4

9) d^2 + 6d - 27

    d^2 + 9d - 3d - 27

    (d^2 + 9d) + (-3d - 27)

    d(d + 9) + -3(d + 9)

    (d + -3)(d + 9)

    (d - 3)(d + 9)

    d = 3, -9

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Mrac [35]

Answer:

Age of teacher = 32 years

Step-by-step explanation:

Average age of 15 students = 16 years

Sum of age of 15 students = 16 * 15 = 240 years

Average of age 15 students and a teacher = 17 years

Sum of age  15 students and a teacher = 17 * 16 =  272 years

Age of teacher = 272 - 240 = 32 years

4 0
3 years ago
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On the graph below are three points X, Y, and Z. Write the coordinates for the given dilation.
Julli [10]

ANSWER

( -  \frac{3}{2} , - 1)

EXPLANATION

From the graph, the coordinates of Y are:

(3,2)

We want to find the image of this point after a dilation by a scale factor of -½ about the origin.

The rule for the dilation is :

(x,y)\to( - \frac{1}{2}  x, -  \frac{1}{2} y)

To find the coordinates of Y', we plug the coordinates of Y.

Y(3,2)\to \: Y'( - \frac{1}{2}  (3), -  \frac{1}{2}(2) )

Y(3,2)\to \: Y'( - \frac{3}{2}, - 1)

The first choice is correct.

6 0
3 years ago
Every time I use a piece of scrap paper, I crumple it up and try to shoot it inside the recycling bin across the room. I'm prett
valentinak56 [21]

Using the binomial distribution, it is found that there is a 0.0012 = 0.12% probability at least two of them make it inside the recycling bin.

<h3>What is the binomial distribution formula?</h3>

The formula is:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • n is the number of trials.
  • p is the probability of a success on a single trial.

With 5 shoots, the probability of making at least one is \frac{211}{243}, hence the probability of making none, P(X = 0), is \frac{232}{243}, hence:

(1 - p)^5 = \frac{232}{243}

\sqrt[5]{(1 - p)^5} = \sqrt[5]{\frac{232}{243}}

1 - p = 0.9908

p = 0.0092

Then, with 6 shoots, the parameters are:

n = 6, p = 0.0092.

The probability that at least two of them make it inside the recycling bin is:

P(X \geq 2) = 1 - P(X < 2)

In which:

[P(X < 2) = P(X = 0) + P(X = 1)

Then:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{6,0}.(0.0092)^{0}.(0.9908)^{6} = 0.9461

P(X = 1) = C_{6,1}.(0.0092)^{1}.(0.9908)^{5} = 0.0527

Then:

P(X < 2) = P(X = 0) + P(X = 1) = 0.9461 + 0.0527 = 0.9988

P(X \geq 2) = 1 - P(X < 2) = 1 - 0.9988 = 0.0012

0.0012 = 0.12% probability at least two of them make it inside the recycling bin.

More can be learned about the binomial distribution at brainly.com/question/24863377

#SPJ1

7 0
2 years ago
Find the prime factorization of the number 12​
Vsevolod [243]

First, you must use a factor tree to find the prime factors of the number.

                           12

                          /   \

                        6      (2)

                      /   \

                    (3) (2)

2 , 2 and 3 are the prime factors that make 12

2 x 2 x 3= 12

Or

2^2 x 3= 12

4 0
3 years ago
Maths<br>-|-30-(10-20)|-|5-(10-15)|=?<br>If someone helped me , I would be grateful​
defon

Answer:

-30

Step-by-step explanation:

-|-30-(10-20)|-|5-(10-15)|=-|-30-(-10)|-|5-(-5)|

=-|-30+10|-|5+5|

=-|-20|-|10|

=-(20)-(10)

= -20-10

= -30

4 0
3 years ago
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