3 years ago

If the sum of a number and seven is doubled, the result is one less than the number. find the number

1 answer:

7 0

(n + 7)2 = n - 1
2n +14 = n - 1
2n - n +14 = n - n - 1
n + 14 -14 = -1 - 14
n = -15
(-15 + 7)2 = -15 - 1
(-8)2 = -16
-16 = -16

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