SAT Math Practice Question #2240 (Medium) | Test Citadel
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SAT Math Difficulty: Medium

Digital SAT Math Practice Question #2240

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For what value of $c$ does $x^2 - 10x + c = 0$ have exactly one real solution?
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Masterclass Solution & Distractor Trap Analysis

A single real solution requires $\Delta = b^2 - 4ac = 0$. $(-10)^2 - 4(1)(c) = 0 \implies 100 - 4c = 0 \implies c = 25$....

Distractor Analysis: Trap choice eliminates careless test-takers who confuse roots with coordinates...

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