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Juli2301 [7.4K]
2 years ago
13

Find the solutions to the quadratic equation below by completing the square. x2 - 8x - 7 = 0

Mathematics
1 answer:
Furkat [3]2 years ago
3 0

Answer:

x=4-\sqrt{23}, x=4+\sqrt{23}

Step-by-step explanation:

(x^2-8x+16)-16-7=0

(x-4)^2=23

x=4-\sqrt{23}, x=4+\sqrt{23}

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20 points plus that brain thing
madam [21]

Answer:

\huge\boxed{\sf \$ \ 26.24}

Step-by-step explanation:

Each side of the squared painting = 41 inches

A square has 4 sides. So,

4 sides of the square painting = 4(41) inches

                                                  = 164 inches

\rule[225]{225}{2}

<u>The shop charges:</u>

1 inches = $ 0.16

Multiply both sides by 164

164 inches = $ 0.16 × 164

164 inches = $ 26.24

\rule[225]{225}{2}

Hope this helped!

<h2>~AnonymousHelper1807</h2>
5 0
3 years ago
Solve for x. <br><br> −1/5x≥−2
Rzqust [24]

Answer:

x ≤ -10

Step-by-step explanation:

distribute -2 into your denominator (5)

7 0
3 years ago
20141
Kryger [21]
What????? Um I’m so sorry I don’t know
8 0
3 years ago
Find the area of rectangle ABCD
satela [25.4K]

9514 1404 393

Answer:

  D. 12

Step-by-step explanation:

There are a number of ways to find the area of this rectangle. Perhaps the most straightforward is to find the lengths of the sides and multiply those. The distance formula is useful.

  d = √((x2 -x1)^2 +(y2 -y1)^2)

Using the two upper-left points, we find the length of that side to be ...

  d = √((3 -0)^2 +(3 -0)^2) = √(9 +9) = √18 = 3√2

Similarly, the length of the lower-left side is ...

  d = √((-2 -0)^2 +(-2 -0)^2) = √(4+4) = √8 = 2√2

Then the area of the rectangle is ...

  A = LW

  A = (3√2)(2√2) = 3·2·(√2)^2 = 3·2·2 = 12

The area of rectangle ABCD is 12.

_____

Other methods include subtracting the area of the corner triangles from the area of the bounding square:

  5^2 -2(1/2)(3·3) -2(1/2)(2·2) = 25 -9 -4 = 12

4 0
2 years ago
PLZ HELP! NO FAKE ANSWER PLEASE!!!!!! PLEASE AND THANK YOU MARRY CHRISTMAS!
lilavasa [31]

Answer:

1. m=1/2

2. x=4/7

3. t=4

4. y=5

Step-by-step explanation:

1. 5m+4=7m+6

5m-7m=6-5

2m=1

m=1/2

2. -5x+3=2x-1

-5x-2x=-1-3

-7x=-4

x= -4/-7= 4/7

3. 5t-3=3t+5

5t-3t=5+3

2t=8

t=8/2= 4

4. 53y-55= 42y

53y-42y=55

11y=55

y=55/11=5

hope it helps!

8 0
2 years ago
Read 2 more answers
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