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Contact [7]
3 years ago
14

Solutions of x2 + 13x + 30 = 0 by factoring.

Mathematics
1 answer:
VMariaS [17]3 years ago
4 0

Answer:

x = -10 or x = -3

Step-by-step explanation:

Here, the given equation is

x^{2}  + 13x + 30 = 0

The given equation can be solved by the method of SPLITTING THE MIDDLE TERM

Split 13 in such a way that sum of the terms = 13

and product of the terms = 30

So, the given equation becomes x^{2}  + 10x + 3x + 30 = 0

Here, 10x+ 3x = 13x and 10 x 3 = 30

Now, simplifying the equation,

x(x+10) + 3(x + 10) = 0 \\(x+3) (x+10) =0

⇒ either (x+ 10) = 0 ,or (x+ 3) = 0

⇒ x = -10 or x = -3

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sesenic [268]

A sandwich store charges a delivery fee to bring lunch to an office.

Delivery cost - D

Meatball sandwich cost  - M

One office pays $40.50 for 5 meatball sandwiches.

40.50 = 5M + D

Another office pays $66.50 for 9 meat ball sandwiches

66.50 = 9M + D

A. How much does each meatball sandwich add to the cost of delivery?

D = 40.50 - 5M = 66.50 - 9M

40.50 - 5M = 66.50 - 9M

9M - 5M = 66.50 - 40.50

4M = 26.00

M = 6.50

B. What is the delivery fee

D = 40.50 - 5M = 40.50 - 5(6.50) = 40.50 - 32.50 = 8.00

Check

66.50 = 9M + D = 9(6.50) + 8 = 58.50 + 8.00 = 66.50

3 0
3 years ago
I NEED HELP I DONT KNOW THIS ANSWER
Papessa [141]

Answer:

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Step-by-step explanation:

4 0
2 years ago
3.
nasty-shy [4]

Answer:

y    

Step-by-step explanation:

6 0
2 years ago
What two numbers add to +5 and have a product of -3?
Tasya [4]
They don't come out even.
As rounded decimals, the two numbers are

<em>5.54138...</em>  and  <em>-0.54138...</em>


6 0
3 years ago
Which value is a part of the domain? <br> -2.7<br> -2.2<br> -1.9
ozzi

Answer:

hmm, i think is -2.2 if am correct.

Step-by-step explanation:

7 0
3 years ago
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