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

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

Mathematics
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first you must add 25 on both sides. : z^2+9z+25
wait a sec, my cp is freezing often
okay did thatt.

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Other answers:

and okk
z^2 + 9z + 20.25 - 20.25 + 25
9z = 2 x 4.5z 4.5^2 = 20.25
ok, so she basically gave you the answer. do you know how to complete the square ( hoe she got 20.25?)
oo yes i do
ok thank youu
http://www.purplemath.com/modules/sqrquad.htm ok! here's a math site that really helps, if you need it.
thank you!!

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