Question

What value should be added to the expression to create a perfect square?



x2 – 20x



A.
25


B.


–25


C.
100


D.


–100

Answer 1

@shadowhuntergaming

Answer 2

@ParthKohli

Answer 3

david help him

Answer 4

lol

Answer 5

@Nurali

Answer 6

a^2-2ab+b^2

Answer 7

\[x^2 - 20x+ \cdots\]\[= (x)^2 - 2(10)(x) + \cdots\]Try to see how similar it is with something like\[(a-b)^2 = a^2 - 2ab + b^2\]

Answer 8

x^2-2(10)(x)+(10)^2

Answer 9

x^2-20x+100

Answer 10

so 100 is right one.

Answer 11

thanks so much @Nurali

Answer 12

My Pleasure.