Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

How many real solutions does x2+4x+5=0x^2 + 4x + 5 = 0 have?

  • A

    2

  • B

    0

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  • C

    Infinitely many

  • D

    1

Explanation

Discriminant =1620=4<0= 16 - 20 = -4 < 0, so no real solutions.

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