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Quadraitic equations

posted by on .

solve with an exact answer.
x^2 + 2x - 8

  • Quadraitic equations - ,

    Start by factoring
    (x+4)(x-2) = 0

    The equation is true if either factor is zero.
    x = +__ or -___

  • Quadraitic equations - ,

    Can you show me the steps please???? to solve this equation.

  • Quadratic equations - ,

    I just did. The final answer is 2 or -4. Do you understand how to factor equations? That might be a topic worth reviewing.

    If you wan to do it the hard way, you can also use the quadratic equation
    x = [-b +/-sqrt(b^2-4ac)]/(2a)
    Then substitute a = 1, b = 2 and c = -8
    sqrt(b^2 -4ac) = sqrt36 = 6
    x = (1/2)*[-2 +/-6]
    = (1/2)(4 or -8)
    = 2 or -4

  • Quadraitic equations - ,

    Thank you so much and I definetly need to review how to factor equations<<<good night and sweet dreams>>>thank you for helping me

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