Digital SAT Math Practice Question #2368
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$a^2 - b^2 = (a - b)(a + b) = 72 \implies 6(a + b) = 72 \implies a + b = 12$. Adding $a - b = 6$ and $a + b = 12$ gives $2a = 18 \implies a = 9$....
Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...
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