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math

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a quadrilateral with angles that mesure: 10x-25, 10x, 3x to the second power, and 2x to the second power. solve for x.

  • math -

    they add up to 360 degrees

    (10x-25) + 10 x + 3 x^2 +2 x^2 = 360

    5 x^2 + 20 x -25 = 360

    5 x^2 + 20 x - 385 = 0

    x^2 + 4 x - 77 = 0

    (x-7)(x+11) = 0

    x = 7
    forget negative 11, no such angle needed

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