12x^2+105x+147=35

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Solution for 12x^2+105x+147=35 equation:


Simplifying
12x2 + 105x + 147 = 35

Reorder the terms:
147 + 105x + 12x2 = 35

Solving
147 + 105x + 12x2 = 35

Solving for variable 'x'.

Reorder the terms:
147 + -35 + 105x + 12x2 = 35 + -35

Combine like terms: 147 + -35 = 112
112 + 105x + 12x2 = 35 + -35

Combine like terms: 35 + -35 = 0
112 + 105x + 12x2 = 0

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

Divide each side by '12'.
9.333333333 + 8.75x + x2 = 0

Move the constant term to the right:

Add '-9.333333333' to each side of the equation.
9.333333333 + 8.75x + -9.333333333 + x2 = 0 + -9.333333333

Reorder the terms:
9.333333333 + -9.333333333 + 8.75x + x2 = 0 + -9.333333333

Combine like terms: 9.333333333 + -9.333333333 = 0.000000000
0.000000000 + 8.75x + x2 = 0 + -9.333333333
8.75x + x2 = 0 + -9.333333333

Combine like terms: 0 + -9.333333333 = -9.333333333
8.75x + x2 = -9.333333333

The x term is 8.75x.  Take half its coefficient (4.375).
Square it (19.140625) and add it to both sides.

Add '19.140625' to each side of the equation.
8.75x + 19.140625 + x2 = -9.333333333 + 19.140625

Reorder the terms:
19.140625 + 8.75x + x2 = -9.333333333 + 19.140625

Combine like terms: -9.333333333 + 19.140625 = 9.807291667
19.140625 + 8.75x + x2 = 9.807291667

Factor a perfect square on the left side:
(x + 4.375)(x + 4.375) = 9.807291667

Calculate the square root of the right side: 3.131659571

Break this problem into two subproblems by setting 
(x + 4.375) equal to 3.131659571 and -3.131659571.

Subproblem 1

x + 4.375 = 3.131659571 Simplifying x + 4.375 = 3.131659571 Reorder the terms: 4.375 + x = 3.131659571 Solving 4.375 + x = 3.131659571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.375' to each side of the equation. 4.375 + -4.375 + x = 3.131659571 + -4.375 Combine like terms: 4.375 + -4.375 = 0.000 0.000 + x = 3.131659571 + -4.375 x = 3.131659571 + -4.375 Combine like terms: 3.131659571 + -4.375 = -1.243340429 x = -1.243340429 Simplifying x = -1.243340429

Subproblem 2

x + 4.375 = -3.131659571 Simplifying x + 4.375 = -3.131659571 Reorder the terms: 4.375 + x = -3.131659571 Solving 4.375 + x = -3.131659571 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-4.375' to each side of the equation. 4.375 + -4.375 + x = -3.131659571 + -4.375 Combine like terms: 4.375 + -4.375 = 0.000 0.000 + x = -3.131659571 + -4.375 x = -3.131659571 + -4.375 Combine like terms: -3.131659571 + -4.375 = -7.506659571 x = -7.506659571 Simplifying x = -7.506659571

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-1.243340429, -7.506659571}

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