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Evaluate the following expressions for x=-3

13)–2x^2 =
14)(-2x)^2 =

10)Use the discriminant to determine
the number of solutions of 3x^2-4x+6=0
8)Solve sqrt[3b] = -3

  • math -

    13. -2*(-3)^2 = -18.

    14. (-2x)^2 = (-2*(-3)^2 = 6^2 = 36.

    10. 3x^2 - 4x + 6 = 0.
    D = sqrt(B^2-4AC).
    D = sqrt(16-72) = sqrt(-56).

    The Discriminant is < 0; therefore, we
    have no real solutions and 2 imaginary
    solutions.

    8. sqrt(3b) = -3
    Square both sides:
    3b = 9
    b = 3,

    CHECK: sqrt(3*3) = sqrt(9)=+3,AND -3.

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