There are no real solutions to this equation because you cannot take the square root of a negative number. However,
x2 + 4 = 0
x2 = -4
sqrt(x2) = sqrt(-4)
x = 2i, -2i
here are the imaginary solutions.
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2x + 4 is an expression, not an equation. There can be no solution set for an expression.
(2x - 10) + 7 = 52x - 3 = 52x = 8x = 4
the empty set.
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