Mathematics, 05.11.2020 17:00 oofoofoof1

When a positive number is to be squared and then have 4 added to the result is mistakenly doubled and then had 5 added. The result is smaller than the correct answer by 15. Find the
original number.

The answer is supposed to be 1 but I don’t know how to solve it

Answers: 2

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When a positive number is to be squared and then have 4 added to the result is mistakenly doubled a...