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.

x > 1.3

step by step:

8.5−0.9x> 9.8−1.9x

step 1: simplify both sides of the inequality.

−0.9x+8.5> −1.9x+9.8

step 2: add 1.9x to both sides.

−0.9x+8.5+1.9x> −1.9x+9.8+1.9x

1x+8.5> 9.8

step 3: subtract 8.5 from both sides.

1x+8.5−8.5> 9.8−8.5

1x> 1.3

step 4: divide both sides by 1.

1x/1 > 1.3/1

x> 6

step-by-step explanation:

8x+8> 7x+14

8x-7x> 14-8

x> 6