blake2001
20.04.2020 •
Mathematics
Which are steps that could be used to solve 0 = 9(x2 + 6x) – 18 by completing the square? Check all that apply.
18 + 81 = 9(x2 + 6x + 9)
18 + 9 = 9(x2 + 6x + 9)
18 + 36 = 9(22 + 6x + 36)
11 = (x + 3)2
07342 = (x + 6)2
199 = (x + 3)2
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Ответ:
A) 18+81=9(x^2+6x+9)
D)11+(x+3)^2
Step-by-step explanation:
To solve this by completing the square, we want to get it to the form of: (x + 3)^2 = 9
There are multiple ways to get there.
First we could divide by 9 to get.
x^2 + 6x = 0
Then, add 9 to both sides to get:
x^2 + 6x + 9 = 9
Factor the left side:
(x + 3)^2 = 9
Now, you can solve this equation by completing the square.
(*I think you have a typo in your answer choices)
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Ответ:
or 90:125
or 90/125