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Tema [17]
3 years ago
13

-x^2+2x=7 complete the square​

Mathematics
1 answer:
ira [324]3 years ago
4 0

Answer:

x=R

Step-by-step explanation:

x

x ^{2}  + 2x =  - 7 \\ (x + 1) {}^{2}  =  \sqrt{ - 7 + 1  }   \\ x = r \\ \\

there's no real solution since a square root cannot be negative

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Find x<br> a) 21 √2<br> b)7<br> c)21 √2/2<br> d)21 √3/2
fgiga [73]

Answer:

C

Step-by-step explanation:

Use the sine ratio in the left, right triangle to find the common side to both triangles and the exact values

sin60° = \frac{\sqrt{3} }{2} , cos45° = \frac{1}{\sqrt{2} } , thus

sin60° = \frac{opposite}{hypotenuse} = \frac{opp}{7\sqrt{3} } = \frac{\sqrt{3} }{2} ( cross- multiply )

2 × opp = 21 ( divide both sides by 2 )

opp = \frac{21}{2}

Now consider the right triangle on the right, using the cosine ratio

cos45° = \frac{adjacent}{hypotenuse} = \frac{\frac{21}{2} }{x} = \frac{1}{\sqrt{2} } ( cross- multiply )

x = \frac{21}{2} × \sqrt{2} = \frac{21\sqrt{2} }{2} → C

5 0
3 years ago
Plz help me schools basically here for me
nevsk [136]

Here's what i did:

I broke down the fraction entirely.

3 / 5 = 6 / 10

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if you need 7 / 10 of the number (30) then do 3*7.

The answer is 21.

8 0
4 years ago
Given the function ƒ(x) = x 2 - 4x - 5 Identify the zeros using factorization. Draw a graph of the function. Its vertex is at (2
s344n2d4d5 [400]
The zeroes of the equation are 5, -1
6 0
3 years ago
If x = 3 units, y = 6 units, and h = 4 units, find the area of the rhombus shown above using decomposition.
eduard

Answer:

= 12 square units

Step-by-step explanation:

Please look at the photo attached below, I think it is fit with your question

To find the area, substitute the values given in the question into the formula given below.

Area = base • height

= x • h

= 3 units • 4 units

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7 0
3 years ago
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Nady [450]

Step-by-step explanation:

here's your answer hope it helps you

5 0
3 years ago
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