If 4x ^ 2 + 2 (M + 3) x + 25 is a complete square, then M =?

If 4x ^ 2 + 2 (M + 3) x + 25 is a complete square, then it is (2x ^ 5) ^ 2
Then there is 2 (M + 3) = soil 2 * 2 * 5
That is, M + 3 = soil 10
That is, M = 7 or - 13

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