Solve the quadratic equation by completing the square.

x2 - 10x + 18 = 0

A) x = 5 ±
7
B) x = -5 ±
7
C) x = 5 ±
43
D) x = -5 ±
43

A

Step-by-step explanation:

x² - 10x + 18 = 0

x² - 2(x)(5) + 5² - 5² + 18 = 0

(x - 5)² = 7

x = 5 + sqrt(7), 5 - sqrt(7)

sqrt: square root

54 kilometers per hour

step-by-step explanation:

according to rules:

1 km = 1000 meter

which means that 1 meter = 1/1000 km

1 hour = 3600 second [ as 1 hour = 60 min = 60 *60 seconds ]

which means that 1 second = 1/3600 hour

therefore, 1 kilometer/hour =

thus to convert 15 meter per second to kilometer per hour, we multiply 15 to 3.6 kilometer/hour.

15 meter/second=   which is the required answer.

sadsdda

step-by-step explanation: