Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 5/5

Polynomial p(x)p(x) when divided by x2x - 2 gives quotient x2+3x+1x^2 + 3x + 1 and remainder 5. What is p(x)p(x)?

  • A

    x3+x25x+7x^3 + x^2 - 5x + 7

  • B

    x3+5x25x^3 + 5x^2 - 5

  • C

    x3+3x2+x+5x^3 + 3x^2 + x + 5

  • D

    x3+x25x+3x^3 + x^2 - 5x + 3

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Explanation

p(x)=(x2)(x2+3x+1)+5=x3+3x2+x2x26x2+5=x3+x25x+3p(x) = (x - 2)(x^2 + 3x + 1) + 5 = x^3 + 3x^2 + x - 2x^2 - 6x - 2 + 5 = x^3 + x^2 - 5x + 3.

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