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VMariaS [17]
3 years ago
5

What are the answers to the following quadratic equation: x^2-4x-12

Mathematics
2 answers:
Alla [95]3 years ago
6 0

Answer:

6 and -2

Step-by-step explanation:

x^2-4x-12

set up equal to zero

x^2-4x-12=0

lets factor:

(x-6)(x+2)=0

x-6=0

x=6

or

x+2=0

x=-2

Fiesta28 [93]3 years ago
5 0

Answer:

x=6  x=-2

Step-by-step explanation:

x^2-4x-12 = 0

Factor

What two numbers multiply to -12 and add to -4

-6*2 = -12

-6+2 = -4

(x-6)(x+2) =0

Using the zero product property

(x-6) =0   x+2 = 0

x=6  x=-2

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A cylinder has a radius of 5cm and a height of 9cm find its total area
Sauron [17]

Answer: 706.5

Step-by-step explanation:

First you have to square the radius. So for this question you multiply 5x5. That makes 25. Then you multiply that with pi ( 3.14 ) and that makes 78.50. Next you multiply it by 9, that makes 706.5.

7 0
3 years ago
The number 20 is less than the diffence of 4 times 8
valina [46]

Answer:

12

Step-by-step explanation:

4 times 8 =32,   32 - 20= 12

8 0
3 years ago
Suppose that a bored student wants to go to a restaurant for lunch, but she only has an hour in which to go, eat, and get back i
Blababa [14]

Missing information

Take local speed ad 30 mph and express your answer in miles

Answer:

7.5 miles

Step-by-step explanation:

Time for lunch is 1 hour but once will wait for 30 minutes before served and eat.

Out of 1 hour, 30 mins is for service and eating to mean time to get from work to restaurant, to and fro is the other 30 mins

Since 30 mins is for to and fro, then one way direction takes 15 mins.

Speed, s=d/t and distance d=speed*time

Given local speed of 30 mph and time as 15 mins,

To convert minutes to hours, we divide it by 60 hence the distance is

30*15/60=7.5 miles

Therefore, the student can go to a restaurant that is 7.5 miles from the office.

4 0
3 years ago
Can anyone help me with primary 5 hw ?
Illusion [34]
B) 28×50, then take the answer - 1100
5 0
3 years ago
(20+.5x)+.15(20+.5x)how do you work this question out
Veronika [31]
Distribute the .15 on the right side to get:
20 + .5x + 3 + .075x

Then, combine like terms (add numbers together and add x terms together):
.575x + 23

...and that's your final answer!
6 0
3 years ago
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