Digital SAT Math Practice Question #2377
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Square both sides: $x^2 - 6x + 9 = x + 9 \implies x^2 - 7x = 0 \implies x(x - 7) = 0$. $x=0$ produces $-3 = 3$ (extraneous). $x = 7$ gives $4 = \sqrt{16} = 4$. So $x = 7$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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