Question

What value completes the square for the expression?

x^2 - 18x
A. 9
B. -9
C. 81
D. -81

Answer 1

@tgawade that other one is too messy

Answer 2

add
\[\left( \frac{ co-efficient ~of ~x }{ 2 } \right)^2\]

Answer 3

Okay use this formula Third term = (middle term(-18) / 2)^2
So we get third term = 81
Now we have third term = 81 so just add & subtract it from equation
x^2 - 18x + 81 - 81 so we now factor out x^2 - 18x + 18 =(x-9)^2
there fore we get (x-9)^2 - 81

Answer 4

so the answer is b ?

Answer 5

yes ? no ?

Answer 6

if we add 81 then it get complete

Answer 7

that doesn't answer my question

Answer 8

so are you saying the answer is c then ?

Answer 9

yes

Answer 10

wow that took a long time