Question 47 Answer and Explanation _ACT June 2008 Form 66C Math Section

Question 47 Answer and Explanation _ACT June 2008 Form 66C Math Section

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47. When using the quadratic formula, Monali found that an equation had solutions x = $5\pm\sqrt{{-9a}^{2}}$ , where a is a positive real number. Which of the following expressions gives Monali's solutions as complex numbers?

A. 5 ± 1ai

B. 5 ± 3ai

C. 5 ± 6ai

D. 5 ± 9ai

E. 5 ± 12ai

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation