Question

z^2 + 9z = -25
how do i solve by completeing the square?

Answer 1

first you must add 25 on both sides. :
z^2+9z+25

Answer 2

wait a sec, my cp is freezing often

Answer 3

okay did thatt.

Answer 4

and okk

Answer 5

z^2 + 9z + 20.25 - 20.25 + 25

Answer 6

9z = 2 x 4.5z
4.5^2 = 20.25

Answer 7

ok, so she basically gave you the answer. do you know how to complete the square ( hoe she got 20.25?)

Answer 8

oo yes i do

Answer 9

ok thank youu

Answer 10

http://www.purplemath.com/modules/sqrquad.htm
ok! here's a math site that really helps, if you need it.

Answer 11

thank you!!