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March 30, 2017

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2x squared plus 6 x plus 3 is equal to 0.....

  • math - ,

    2x^2 + 6x +3 = 0
    That does not factor into terms with integers. Use the quadratic formula
    x= [-b +/-sqrt(b^2-4ac)]/2a

    x = [-6 +/-sqrt(36 -24)]/4
    = [-6 +/-sqrt12]/4
    = -2.366 or -0.634

  • math - ,

    2 x ^ 2 + 6 x + 3 = 0

    Compare your equation to the standard form :

    a x ^ 2 + b x + c = 0

    and identify the values for a , b , c.

    a = 2

    b = 6

    c = 3

    Now evaluate the discriminant :

    b ^ 2 - 4 a c = 6 ^ 2 - 4 * 2 * 3 = 36 -
    24 = 12

    Since b ^ 2 - 4 ac > 0 there are two unequal real solutions:


    x1 = [ - b + sqrt ( b ^ 2 - 4 a c ) ] / 2 a

    x1 = [ - 6 + sqrt ( 12 ) ] / 2 * 2

    x1 = [ - 6 + sqrt ( 4 * 3 ) ] / 4

    x1 = [ - 6 + 2 * sqrt ( 3 ) ] / 4

    x1 = 2 * [ - 3 + sqrt ( 3 ) ] / 2 * 2

    x1 = [ - 3 + sqrt ( 3 ) ] / 2

    x1 = [ sqrt ( 3 ) - 3 ] / 2

    x1 = - 0.63 approx.


    x2 = [ - b - sqrt ( b ^ 2 - 4 a c ) ] / 2 a

    x2 = [ - 6 - sqrt ( 12 ) ] / 2 * 2

    x2 = [ - 6 - sqrt ( 4 * 3 ) ] / 4

    x2 = [ - 6 - 2 * sqrt ( 3 ) ] / 4

    x2 = 2 * [ - 3 - sqrt ( 3 ) ] / 2 * 2

    x2 = [ - 3 - sqrt ( 3 ) ] / 2

    x2 = [ - 3 - sqrt ( 3 ) ] / 2

    x2 = - 2.37 approx.

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