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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

Solve 5x2=20x5x^2 = 20x.

  • A

    x=0,5x = 0, 5

  • B

    x=0,4x = 0, 4

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  • C

    x=0,20x = 0, 20

  • D

    x=4x = 4

Explanation

5x2−20x=05x^2 - 20x = 0, 5x(x−4)=05x(x-4) = 0, x=0x = 0 or x=4x = 4.

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