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Oksana_A [137]
3 years ago
5

the square of 9 more than a number is equal to 9 more than the square of the number. what is the number?

Mathematics
1 answer:
AnnZ [28]3 years ago
3 0
(x+9)^2 = x^2 +9
x^2 +18x + 81 = x^2 +9
18x = -72
 x = -4
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