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4 years ago

Which of the following is a solution of x2 + 2x + 8? (1 point)

Mathematics

1 answer:

Mrrafil [7]4 years ago

4 0

Answer

−1 + i times the square root of 7

Explanation

x² + 2x + 8

I will use the complete square method to find the value of x.

x² + 2x + 8

x² + 2x = -8

x² + 2x + (2/2)² = -8 + (2/2)²

x² + 2x + 1 = -7

(x + 1)² = -7

x + 1 = √(-7)

x = √(-7) - 1

= i√7 - 1

= -1 + i√7

−1 + i times the square root of 7

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3 years ago

A bus and a train leave the same station at the same time and travel in the same direction along parallel routes. The train runs

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Answer:

Smallest rate for the train is 50 mph and largest is 60 mph.

For the bus it is 25 and 30 mph.

Step-by-step explanation:

If the speed of the train is 2x then speed of the bus is x mph, and the train travels twice as far as the bus in a given time.

Distance = speed * time

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d = 2x * 0.5 for the train

x = d

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In a similar fashion we can show that the smallest rate for the train is

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3 years ago