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umka21 [38]
3 years ago
14

Calculate the discriminant. x2 – x – 2 = 0

Mathematics
1 answer:
nikitadnepr [17]3 years ago
6 0
\Delta=(-1)^2-4\cdot1\cdot(-2)=1+8=9
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Please help asap!!!!
iren2701 [21]

Answer:

C

Step-by-step explanation:

yeyeyeye

8 0
3 years ago
Which graph represents the solution<br><br>8 - 3x ≥ -4​
Vedmedyk [2.9K]

Answer:

3rd option

Step-by-step explanation:

8 - 3x ≥ - 4 ( subtract 8 from both sides )

- 3x ≥ - 12

divide both sides by - 3 , reversing the symbol as a result of dividing by a negative quantity.

x ≤ 4

since ≤ the circle on number line is solid ( not open )

since less than 4 then arrow points left away from 4

the solution is shown on the third graph

6 0
2 years ago
Help me with this please
alina1380 [7]
If you assign variables to the problem, it can make things a lot simpler. Lets say chairs are x and tables are y. Therefore you have:
2x+6y=40 
5x+3y=25
Now you can isolate the variable of one equation and put it into another (it doesn't matter which. I'm going to manipulate the top equation to plug into the bottom one).
2x=40-6y 
x=20-3y
Now I plug into bottom equatioin:
5(20-3y) + 3y=25
100-15y+3y=25
100-12y=25
-12y=-75
y=$6.25
Now you can plug in y in either equation to get x. 
2x+6(6.25)=40
37.5+2x=40
2x=2.5
x=1.25
So it costs $6.25 for each table and $1.25 for each chair. If you think about it, it would make sense for the table to cost more for the chair. 
6 0
3 years ago
Factorise <br> 84xy+196x-36y-84
LenaWriter [7]

Hi,

84xy+196x-36y-84

4(21xy+49x-9y-21)

4(7x × (3y+7)-9y-21)

4(7x × (3y+7)-3(3y+7)

4(3y+7)×(7x-3)

4 0
3 years ago
In the equation b=25+8. what is the next step in the equation soving sequence?
DedPeter [7]
The next step in the equation is the quotient
6 0
3 years ago
Read 2 more answers
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