Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 5/5

For what value of cc does 2x2+4x+c=02x^2 + 4x + c = 0 have a repeated root?

  • A

    c=8c = 8

  • B

    c=1c = 1

  • C

    c=2c = 2

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  • D

    c=4c = 4

Explanation

D=168c=0D = 16 - 8c = 0, so c=2c = 2.

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