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Solving Quadratic Equations: Factoring

Question 7 • FL-1200700-Mathematics for College Algebra MIS

Use the square root property of equality to solve(x – 3)2 = –4.The solutions are .

Answer
A
–1 or 7
B
1 or 5
C
3 ± 2i
D
3 ± 4i

Explanation

Take the square root of both sides: x − 3 = ±√(−4) = ±2i, since i² = −1. Add 3 to both sides to get x = 3 ± 2i, so the solutions are 3 + 2i and 3 − 2i; this matches choice C.

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