Set 16: Quadratic Equations (Advanced)

Choice B is correct. Choice B is the correct answer. Before taking the square root, isolate the squared term. 1. Divide both sides by 2: $x^2 = 25$. 2. Take the square root of both sides: $x = \pm \sqrt{25}$. 3. Solve: $x = \pm 5$. Choice A is incorrect because it forgets to take the square root. Choice C is incorrect because it forgets to take the square root of 25. Choice D is incorrect because it misses the negative solution.