What number must be added to the expression below to complete the square x2-20x?

100

Step-by-step explanation:

I believe you meant x^2 - 20x; " ^ " denotes exponentiation.

Take half the coefficient of the x term (which in this problem is -20).  We get -10.  Now square this, obtaining 100.

Adding 100 to x^2 - 20x "completes the square."

100.

Step-by-step explanation:

We have been given an expression . We are asked to find the number that must be added to the expression to complete the square.

We know that a perfect square is in form .

To complete a square we need to add the half the square of b that is .

Upon looking at our given expression we can see that b is equal to 20, so would be:

Therefore, we must add 100 to our given expression to complete the square.

256π units²   (answer b)

step-by-step explanation:

the formula for the surface area of a sphere of radius r

is             a = 4πr²

and so, if r = 8 units, then the surface area is:

a = 4π(8 units)² = 256π units²   (answer b)

it depends on the weather. because i have flown to seattle when it was pouring down rain and there was one time i flew to ohio when it was snowing hard. whats your situation.

step-by-step explanation: