Find the value of c that makes the expression a perfect square trinomial. then write the expression as the square of a binomial.
x^2+7x+c

For this case we have the following trinomial:

To find the value of c that makes the expression a perfect square, we must complete the square.

We have then:

Rewriting we have:

Therefore the value of c is given by:

Then, the expression written as a binomial is:

the value of c that makes the expression to perfect square trinomial is:

The expression as the square of a binomial is:

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.