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Solve the following quadratic equations: 3x2 + 4x − 2 = 0 2x2 − 3x − 7 = 0 3q2 − 5q − 5 = 0

Mathematics

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1) Solve 3x2+4x−2=03x^2 + 4x - 2 = 0

  1. Identify the coefficients.

    For the quadratic equation ax2+bx+c=0ax^2 + bx + c = 0, we have a=3a=3, b=4b=4, and c=−2c=-2.

  2. Apply the quadratic formula.

    The quadratic formula is x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}.
    Substitute the values of aa, bb, and cc:

    x=−(4)±(4)2−4(3)(−2)2(3)x = \frac{-(4) \pm \sqrt{(4)^2 - 4(3)(-2)}}{2(3)}
  3. Simplify the expression.

    x=−4±16−(−24)6x = \frac{-4 \pm \sqrt{16 - (-24)}}{6} x=−4±16+246x = \frac{-4 \pm \sqrt{16 + 24}}{6} x=−4±406x = \frac{-4 \pm \sqrt{40}}{6} x=−4±4×106x = \frac{-4 \pm \sqrt{4 \times 10}}{6} x=−4±2106x = \frac{-4 \pm 2\sqrt{10}}{6}

    Divide all terms by 2:

    x=−2±103x = \frac{-2 \pm \sqrt{10}}{3}

    The solutions are x=−2±103\boxed{x = \frac{-2 \pm \sqrt{10}}{3}}.

    2) Solve 2x2−3x−7=02x^2 - 3x - 7 = 0

  4. Identify the coefficients.

    For ax2+bx+c=0ax^2 + bx + c = 0, we have a=2a=2, b=−3b=-3, and c=−7c=-7.

  5. Apply the quadratic formula.

    x=−b±b2−4ac2ax = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

    Substitute the values:

    x=−(−3)±(−3)2−4(2)(−7)2(2)x = \frac{-(-3) \pm \sqrt{(-3)^2 - 4(2)(-7)}}{2(2)}
  6. Simplify the expression.

    x=3±9−(−56)4x = \frac{3 \pm \sqrt{9 - (-56)}}{4} x=3±9+564x = \frac{3 \pm \sqrt{9 + 56}}{4} x=3±654x = \frac{3 \pm \sqrt{65}}{4}

    The solutions are x=3±654\boxed{x = \frac{3 \pm \sqrt{65}}{4}}.

    3) Solve 3q2−5q−5=03q^2 - 5q - 5 = 0

  7. Identify the coefficients.

    For aq2+bq+c=0aq^2 + bq + c = 0, we have a=3a=3, b=−5b=-5, and c=−5c=-5.

  8. Apply the quadratic formula.

    q=−b±b2−4ac2aq = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}

    Substitute the values:

    q=−(−5)±(−5)2−4(3)(−5)2(3)q = \frac{-(-5) \pm \sqrt{(-5)^2 - 4(3)(-5)}}{2(3)}
  9. Simplify the expression.

    q=5±25−(−60)6q = \frac{5 \pm \sqrt{25 - (-60)}}{6} q=5±25+606q = \frac{5 \pm \sqrt{25 + 60}}{6} q=5±856q = \frac{5 \pm \sqrt{85}}{6}

    The solutions are q=5±856\boxed{q = \frac{5 \pm \sqrt{85}}{6}}.

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