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Elis [28]
3 years ago
11

What number should be added to both sides of the equation to complete the square x^2+8×=4​

Mathematics
2 answers:
svp [43]3 years ago
7 0

Answer:

16

Step-by-step explanation:

Lana71 [14]3 years ago
7 0

Answer:

16

Step-by-step explanation:

For a quadratic equation in the from

x² + Bx = C,

to complete the square, we need to add (B/2)² to both sides

in this case

x² + 8x = 4

we will need to add (8/2)² = 4² = 16 to both sides

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You are planning to make an open rectangular box from a 25​-in.-by-49​-in. piece of cardboard by cutting congruent squares from
Darya [45]

Answer:

The dimensions of the box are 38.48 x 14.48 x 5.26 in.

Step-by-step explanation:

We will have a piece of cardboard with squares of side x cut from the corners to make a open box.

The volume of the box can be written as:

V=A\cdot B\cdot x\\\\V=(49-2x)\cdot (25-2x)\cdot x\\\\V=x\cdot (4x^2-2x*(49+25)+49*25)\\\\V=4x^3-148x^2+1225x

To calculate the maximum volume, we derive and equal to zero

dV/dx=12x^2-296x+1225=0

We apply the quadratic equation to know the roots of the equation

x=\frac{-b\pm\sqrt{b^24ac}}{2a}\\\\x=\frac{296\pm\sqrt{296^2-4*12*1225}}{2*12}  =\frac{296\pm\sqrt{87616-58800}}{24}= \frac{296\pm\sqrt{28816}}{24}\\\\x=\frac{296\pm169.75}{24}= 12.333\pm7.073\\\\\\x_1=12.333+7.073=19.406\\\\x_2=12.333-7.073=5.26

The first solution is physically impossible, as the side that is cut would be bigger than 25.

So the real solution is for x=5.26 in.

Then, the dimensions of the box are:

A=49-2x=49-2*5.26=49-10.52=38.48\\\\B=25-2x=25-10.52=14.48

8 0
3 years ago
A model is made of a car. The car is 5 feet long, and the model is 8 inches long. What is the ratio of the length of the car to
olya-2409 [2.1K]
The answer is 5:8. Hope this helps!
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Pick any number for n        n(y) = n(3/2x + 4)        n(y) = n(3/2x) + n(4) 
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3 years ago
Need help with these two questions
dlinn [17]

Answer:

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8 0
3 years ago
If you have 1996 cookies and someone takes away 2334
Lelechka [254]
-338 is the answer or you got no cookies <3
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