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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

If the roots of x2+bx−12=0x^2 + bx - 12 = 0 are rr and ss with r+s=4r + s = 4, what is bb?

  • A

    −4-4

    check_circle
  • B

    44

  • C

    1212

  • D

    −12-12

Explanation

Sum of roots =−b= -b, so 4=−b4 = -b, b=−4b = -4.

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