SAT Math Practice Question #38154 - SATify | SATify

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SAT Math Practice Question #38154 - SATify | SATify

#38154

equations

quadratic equations

hard

90 sec

Calculator OK

For what value of $c$ does the equation $x^{2} - 4 x + c = 0$ have exactly one real solution?

A.

-4

B.

0

C.

2

D.

4