SAT Prep

Answer to Math #2

Answer: B
Difficulty: Medium

This is a perfect question to Plug In Answers (PIA).  Since you know that x = 4, but you don’t know what k equals, if you plug in each answer choice you will find that B) 2 is the answer that works.

\sqrt{13t^{2}+12}-2x=0

\sqrt{13(2)^{2}+12}-2(4)=0

\sqrt{13(4)+12}-8=0

\sqrt{52+12}-8=0

\sqrt{64}-8=0

8-8=0

0=0