3x^2+14x+42=0

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Solution for 3x^2+14x+42=0 equation:


Simplifying
3x2 + 14x + 42 = 0

Reorder the terms:
42 + 14x + 3x2 = 0

Solving
42 + 14x + 3x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
14 + 4.666666667x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + 4.666666667x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + 4.666666667x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + 4.666666667x + x2 = 0 + -14
4.666666667x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
4.666666667x + x2 = -14

The x term is 4.666666667x.  Take half its coefficient (2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
4.666666667x + 5.444444448 + x2 = -14 + 5.444444448

Reorder the terms:
5.444444448 + 4.666666667x + x2 = -14 + 5.444444448

Combine like terms: -14 + 5.444444448 = -8.555555552
5.444444448 + 4.666666667x + x2 = -8.555555552

Factor a perfect square on the left side:
(x + 2.333333334)(x + 2.333333334) = -8.555555552

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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