Question

What number must you add to complete the square? x^2 + 18x = -13

Answer 1

LInear equation in two variables

Answer 2

i need the number

Answer 3

+-9^2

Answer 4

factorise it firstly

x(x - 18) = 0


then if the answer is 0 one of the 2 parts of the equation must equal 0 as anything times 0 equals 0

x * 0 = 0 (* equals times by)

therfore x = 0

and (x - 18) = 0

x = 18

hope that helps

Answer 5

thanks (:

Answer 6

Your welcome:)

Answer 7

\[\huge x(x - 18) = 0\]


then if the answer is 0 one of the 2 parts of the equation must equal 0 as anything times 0 equals 0

\[\huge x * 0 = 0\] (* equals times by)

\[\huge \therefore \quad x = 0 \]
and (x - 18) = 0

\[\huge x = 18 \leftarrow ANSWER\]

Answer 8

@Isaacisbeast123 copied from http://answers.yahoo.com/question/index?qid=20100714075357AAb6Fgo

Answer 9

@lgbasallote vote me