Set 4: Quadratic Equations (Advanced)

Choice A is correct. Choice A is the correct answer. 1. Expand $(2 x - 3)^2$: $(2 x)^2 - 2(2 x)(3) + 3^2 = 4 x^2 - 12 x + 9$. 2. Subtract 5: $(4 x^2 - 12 x + 9) - 5$. 3. Simplify: $4x^2 - 12 x + 4$. Choice B is incorrect because the middle term is $-2(2 x)(3) = -12 x$, not $-6 x$. Choice C is incorrect because it subtracts 5 from -9 (sign error). Choice D is incorrect because $(2 x)^2 = 4 x^2$, not $2x^2$.