If the square of x-4x + the square of Y + 2Y + 5 = 0, find the square of 2x-y

If the square of x-4x + the square of Y + 2Y + 5 = 0, find the square of 2x-y

The square of x-4x + the square of Y + 2Y + 5 = 0 x ^ 2-4x + 4 + y ^ 2 + 2Y + 1 = 0 [^ 2 is the square, 5 is divided into 4 + 1] (X-2) ^ 2 + (y + 1) ^ 2 = 0. Because the complete square is not less than 0, the sum of two complete squares is 0 only when they are both 0, so X-2 = 0 and y + 1 = 0, then x = 2, y = - 1, then 2x-y = 4 - (- 1) = 4

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