3x^2-35x+42=0

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Solution for 3x^2-35x+42=0 equation:


Simplifying
3x2 + -35x + 42 = 0

Reorder the terms:
42 + -35x + 3x2 = 0

Solving
42 + -35x + 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 + -11.66666667x + x2 = 0

Move the constant term to the right:

Add '-14' to each side of the equation.
14 + -11.66666667x + -14 + x2 = 0 + -14

Reorder the terms:
14 + -14 + -11.66666667x + x2 = 0 + -14

Combine like terms: 14 + -14 = 0
0 + -11.66666667x + x2 = 0 + -14
-11.66666667x + x2 = 0 + -14

Combine like terms: 0 + -14 = -14
-11.66666667x + x2 = -14

The x term is -11.66666667x.  Take half its coefficient (-5.833333335).
Square it (34.02777780) and add it to both sides.

Add '34.02777780' to each side of the equation.
-11.66666667x + 34.02777780 + x2 = -14 + 34.02777780

Reorder the terms:
34.02777780 + -11.66666667x + x2 = -14 + 34.02777780

Combine like terms: -14 + 34.02777780 = 20.0277778
34.02777780 + -11.66666667x + x2 = 20.0277778

Factor a perfect square on the left side:
(x + -5.833333335)(x + -5.833333335) = 20.0277778

Calculate the square root of the right side: 4.47524053

Break this problem into two subproblems by setting 
(x + -5.833333335) equal to 4.47524053 and -4.47524053.

Subproblem 1

x + -5.833333335 = 4.47524053 Simplifying x + -5.833333335 = 4.47524053 Reorder the terms: -5.833333335 + x = 4.47524053 Solving -5.833333335 + x = 4.47524053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.833333335' to each side of the equation. -5.833333335 + 5.833333335 + x = 4.47524053 + 5.833333335 Combine like terms: -5.833333335 + 5.833333335 = 0.000000000 0.000000000 + x = 4.47524053 + 5.833333335 x = 4.47524053 + 5.833333335 Combine like terms: 4.47524053 + 5.833333335 = 10.308573865 x = 10.308573865 Simplifying x = 10.308573865

Subproblem 2

x + -5.833333335 = -4.47524053 Simplifying x + -5.833333335 = -4.47524053 Reorder the terms: -5.833333335 + x = -4.47524053 Solving -5.833333335 + x = -4.47524053 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5.833333335' to each side of the equation. -5.833333335 + 5.833333335 + x = -4.47524053 + 5.833333335 Combine like terms: -5.833333335 + 5.833333335 = 0.000000000 0.000000000 + x = -4.47524053 + 5.833333335 x = -4.47524053 + 5.833333335 Combine like terms: -4.47524053 + 5.833333335 = 1.358092805 x = 1.358092805 Simplifying x = 1.358092805

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.308573865, 1.358092805}

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