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zaharov [31]
3 years ago
14

X^2-2x−4=0 please leave ans in surd form and simplify​

Mathematics
2 answers:
Vlada [557]3 years ago
6 0

<em>Hi there!</em>

<em>How are you?</em>

<em>Answer:</em>

<em />\boxed{x = + \sqrt{5} |Or| x = 1 - \sqrt{5}  }<em />

<em>Step-by-step explanation:</em>

<em>First you have to use quadratic formula with </em>a=1, b=-2, c=-4.<em />

<em />x = \frac{-b \± \sqrt{b^2 -4ac} }{2a}<em />

<em />x = \frac{-(-2) \± \sqrt{(-2)^2 - 4(1)(-4)} }{2(1)}<em />

<em />x = \frac{\sqrt{^2\± \sqrt{20} } }{2}<em />

<em />x = + \sqrt{5}<em> or </em>x = 1 - \sqrt{5}<em />

<em>Hvae a good day/night!</em>

Jobisdone [24]3 years ago
3 0

Step-by-step explanation:

using the quadratic formula......

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Laura has 24 stamps from each of 6 different countries. She can fit 4 stamps on each display sheets of an album. How many displa
Ket [755]
B. 36
To find the number of sheets that Laura is going to fill with her stamps, we first have to find the total number of stamps.
If she has 24 stamps EACH from 6 countries, to get the total, we will multiply
24 x 6 = 144 total number of stamps.

to see how many sheets she will fill we will DIVIDE the total number of stamps by 4 because that is the number she can fit onto One display sheet.
144 ÷ 4 = 36
36 sheets will be used to put four stamps each from a total of 144 stamps.
3 0
2 years ago
Find the area and perimeter of the rectangle Length = 5cm Breadth =2cm
avanturin [10]

Answer:

perimeter: 14

Area: 10

Step-by-step explanation:

PERIMETER

2x(L+B) = 2x(5+2) = 2x(7) = 14

AREA

LxB = 5x2 = 10

PLEASE MARK ME BRAINLIEST

5 0
3 years ago
PLS HELP ME
lianna [129]

Answer: Percentage increase: 57%

Percent increase if the airline charges an additional 50:  14.5% or 15%

Depends if your teacher wants more accurate results with the decimal, or rounded up with 15.

Step-by-step explanation:

Ill explain in the comments bc for some reason its not letting me put it here

7 0
2 years ago
A piece of wire of length L will be cut into two pieces, one piece to form a square and the other piece to form an equilateral t
inn [45]

Answer:

  (a)  square: L; triangle: 0.

  (b)  square: L·(-16+12√3)/11; triangle: L·(27-12√3)/11

Step-by-step explanation:

<u>Strategy</u>: First we will write each area in terms of its perimeter. Then we will find the total area in terms of the amount devoted to the square. Differentiating will give a way to find the minimum total area.

__

In terms of its perimeter p, the area of a square is ...

  A_square = p^2/16

In terms of its perimeter p, the area of an equilateral triangle is ...

  A_triangle = p^2/(12√3)

Then the total area of the two figures whose total perimeter is L with "x" devoted to the square is ...

  A_total = x^2/16 + (L-x)^2/(12√3)

__

(a) We know when polygons are regular, the one with the most area for the least perimeter is the one with the most sides. Hence, the total area is maximized when all of the wire is devoted to the square.

__

(b) The derivative of A_total with respect to x is ...

  dA/dx = x/8 -(L-x)/(6√3)

This will be zero when ...

  x/8 = (L-x)/(6√3)

  x(6√3) = 8L -8x

  x(8 +6√3) = 8L

  x = L·8/(6√3 +8) = 8L(6√3 -8)/(64-108)

  x = L·(12√3 -16)/11

The total area is minimized when L·(12√3 -16)/11 is devoted to the square, and the balance is devoted to the triangle.

5 0
3 years ago
Solve for g<br> 2h - 49 = 12
frez [133]

Answer: h = 30.5

Step-by-step explanation

2h - 49 = 12

     +49 +49

Add 49 to both sides. Inverse operation

2h = 61

2h/2 = 61/2

Divide 2 to both sides to get answer. Inverse operation

h = 30.5

Check:

2(30.5) - 49 = 12

       61 - 49 = 12

               12 = 12

5 0
2 years ago
Read 2 more answers
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