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Factor x^2 + 25 in the complex numbers.
Answer: C) (x + 5i)(x - 5i)
Step-by-step explanation:
Factor using the difference of squares: a² - b² = (a + b)(a - b)
x² + 25
= x² - -25
= √(x²) - √-25
a=x b=5i
= (x + 5i)(x - 5i)