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kondaur [170]
3 years ago
9

Solve the question by completing the sqaure x² + 4x = 0?

Mathematics
1 answer:
n200080 [17]3 years ago
3 0

Answer:

x = 0 or -4

Step-by-step explanation:

x² + 4x = 0

To complete the square, take half of the middle coefficient, square it, then add to both sides.

(4/2)² = 2² = 4

x² + 4x + 4 = 4

(x + 2)² = 4

x + 2 = ±2

x = -2 ± 2

x = 0 or -4

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How do i solve 1+1=0
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Answer:

Logically that's not possible but if you want to prove it then, you have to use a trick.

Step-by-step explanation:

1 + 1 = 1 + \sqrt{1}

        = 1 + \sqrt{(-1) * (-1)}  

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7 0
3 years ago
The first aircraft has 51 more seats than the second aircraft. the third aircraft has 54 fewer seats than the second aircraft. i
NikAS [45]

Let a = aircraft 1 seats

Let b = aircraft 2 seats

Let c = aircraft 3 seats

From the information given above, let's make basic equations.

a=51+b

b=b

c=b-54

a+b+c=411

We can begin to plug in values we know.

51+b+b+b-54=411

3b-3=411

3b=414

b=138

We now know that the second aircraft has 138 seats. Now we can plug in this value to find the value of the other seats. Let's start with the first aircraft.

a=51+b

a=51+138

a=189

We now know that the first aircraft has 189 seats. Let's now finally solve for the third aircraft.

c=b-54

c=138-54

c=84

Finally, we know that aircraft 3 has 84 seats. To check our work, let's make sure that each of these values add up to 411.

a+b+c=411

189+138+84=411

411=411

This is true, therefore the values are correct.


Aircraft 1: 189 seats

Aircraft 2: 138 seats

Aircraft 3: 84 seats

4 0
3 years ago
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