Digital SAT Math Practice Question #2309
Test your problem-solving accuracy on this official-caliber item. Select an answer choice to check your reasoning instantly.
Desmos Hack: Graph the left and right sides of any equation to instantly view intersection points and filter out extraneous solutions.
Isolate radical: $2\sqrt{x - 1} = 8 \implies \sqrt{x - 1} = 4$. Square both sides: $x - 1 = 16 \implies x = 17$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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