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A number and its square: form x^2 +- x = c and solve

This type of question, asked 2 times: CDS 1 2018, CDS 1 2022. All 2 questions below, oldest first.

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  1. Question 1

    CDS 1 2018

    20
    The sum of a number and its square is 20. Then the number is

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  2. Question 2

    CDS 1 2022

    23
    If squaring a positive real number xx is same as adding 12, then what is xx equal to?

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