Question

What number must I add to complete the square?

x^2 - 20x = 17

Answer 1

My choices of answers

Answer 2

feel free to go through the steps with me if you want!

Answer 3

-100 but you know why?

Answer 4

No I do not ...

Answer 5

how would you factorize this
x^2 - 20x - 100 ?

Answer 6

know how?

Answer 7

sorry, my bad, it's +100

Answer 8

x^2 - 20x +100 = (x-10)(x-10)

Answer 9

so by adding 100 to both sides you managed to convert the incomplete square "x^2 - 20x" to a square :)

Answer 10

Thank you again, very helpful in explaining

Answer 11

no worries buddy