3x^2-42x=14

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Solution for 3x^2-42x=14 equation:


Simplifying
3x2 + -42x = 14

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

Solving
-42x + 3x2 = 14

Solving for variable 'x'.

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

Combine like terms: 14 + -14 = 0
-14 + -42x + 3x2 = 0

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

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

Move the constant term to the right:

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

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

Combine like terms: -4.666666667 + 4.666666667 = 0.000000000
0.000000000 + -14x + x2 = 0 + 4.666666667
-14x + x2 = 0 + 4.666666667

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

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = 4.666666667 + 49

Reorder the terms:
49 + -14x + x2 = 4.666666667 + 49

Combine like terms: 4.666666667 + 49 = 53.666666667
49 + -14x + x2 = 53.666666667

Factor a perfect square on the left side:
(x + -7)(x + -7) = 53.666666667

Calculate the square root of the right side: 7.325753659

Break this problem into two subproblems by setting 
(x + -7) equal to 7.325753659 and -7.325753659.

Subproblem 1

x + -7 = 7.325753659 Simplifying x + -7 = 7.325753659 Reorder the terms: -7 + x = 7.325753659 Solving -7 + x = 7.325753659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 7.325753659 + 7 Combine like terms: -7 + 7 = 0 0 + x = 7.325753659 + 7 x = 7.325753659 + 7 Combine like terms: 7.325753659 + 7 = 14.325753659 x = 14.325753659 Simplifying x = 14.325753659

Subproblem 2

x + -7 = -7.325753659 Simplifying x + -7 = -7.325753659 Reorder the terms: -7 + x = -7.325753659 Solving -7 + x = -7.325753659 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -7.325753659 + 7 Combine like terms: -7 + 7 = 0 0 + x = -7.325753659 + 7 x = -7.325753659 + 7 Combine like terms: -7.325753659 + 7 = -0.325753659 x = -0.325753659 Simplifying x = -0.325753659

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.325753659, -0.325753659}

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