Step-by-step explanation:
Two integers are relatively prime ( or coprime ) if there is no integer greater than one that divides them both ( that is, their greatest common divisor is one.
Answer:
Use the Quadratic Formula.
-x² - 4x + 16 = 0
x = [4±√(4²-4(-1)(16)]/[2(-1)] = [4±√80]/(-2) = [4±4√5]/(-2) = -2±2√5
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