SAT Question 8452c42b: Equivalent Expressions answer and explanation with Desmos solution

Choice A is incorrect. This expression is equivalent to $\left(50\right)\left(5\right)x^2$, not $\left(50+5\right)x^2$.

Choice B is incorrect. This expression is equivalent to $\left(\frac{50}{5}\right)x^2$, not $\left(50+5\right)x^2$.

Choice C is incorrect. This expression is equivalent to $\left(50-5\right)x^2$, not $\left(50+5\right)x^2$.