Submit a: what are the solutions to the quadratic equation x2+4=0? b: what is the factored form of the quadratic expression x2+4? select one answer for question a, and select one answer for question b. a: x=−2 a: x=2i or x=−2i a: x=2i a: x=2 or x=−2 b: (x+2i)(x−2i) b: (x+2)(x+2) b: (x+2i)(x+2i) b: (x+2)(x−2)

  A: x=2i or x=−2i

  B: (x+2i)(x-2i)

Step-by-step explanation:

A: Subtracting 4 from the equation gives ...

  x² = -4

Taking the square root gives the imaginary result(s) ...

  x = ±√(-4) = ±2i

So, the solutions are ...

  x = 2i or x = -2i

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B: If x=a is a solution to a quadratic equation, then (x-a) is a factor of it. The factored form of the equation is ...

  (x -2i)(x +2i) = 0

So the factored form of the expression on the left can be written as ...

  (x+2i)(x-2i)