2.1x^2+6.945x=10

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Solution for 2.1x^2+6.945x=10 equation:


Simplifying
2.1x2 + 6.945x = 10

Reorder the terms:
6.945x + 2.1x2 = 10

Solving
6.945x + 2.1x2 = 10

Solving for variable 'x'.

Reorder the terms:
-10 + 6.945x + 2.1x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-10 + 6.945x + 2.1x2 = 0

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

Divide each side by '2.1'.
-4.761904762 + 3.307142857x + x2 = 0

Move the constant term to the right:

Add '4.761904762' to each side of the equation.
-4.761904762 + 3.307142857x + 4.761904762 + x2 = 0 + 4.761904762

Reorder the terms:
-4.761904762 + 4.761904762 + 3.307142857x + x2 = 0 + 4.761904762

Combine like terms: -4.761904762 + 4.761904762 = 0.000000000
0.000000000 + 3.307142857x + x2 = 0 + 4.761904762
3.307142857x + x2 = 0 + 4.761904762

Combine like terms: 0 + 4.761904762 = 4.761904762
3.307142857x + x2 = 4.761904762

The x term is 3.307142857x.  Take half its coefficient (1.653571429).
Square it (2.734298471) and add it to both sides.

Add '2.734298471' to each side of the equation.
3.307142857x + 2.734298471 + x2 = 4.761904762 + 2.734298471

Reorder the terms:
2.734298471 + 3.307142857x + x2 = 4.761904762 + 2.734298471

Combine like terms: 4.761904762 + 2.734298471 = 7.496203233
2.734298471 + 3.307142857x + x2 = 7.496203233

Factor a perfect square on the left side:
(x + 1.653571429)(x + 1.653571429) = 7.496203233

Calculate the square root of the right side: 2.737919508

Break this problem into two subproblems by setting 
(x + 1.653571429) equal to 2.737919508 and -2.737919508.

Subproblem 1

x + 1.653571429 = 2.737919508 Simplifying x + 1.653571429 = 2.737919508 Reorder the terms: 1.653571429 + x = 2.737919508 Solving 1.653571429 + x = 2.737919508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.653571429' to each side of the equation. 1.653571429 + -1.653571429 + x = 2.737919508 + -1.653571429 Combine like terms: 1.653571429 + -1.653571429 = 0.000000000 0.000000000 + x = 2.737919508 + -1.653571429 x = 2.737919508 + -1.653571429 Combine like terms: 2.737919508 + -1.653571429 = 1.084348079 x = 1.084348079 Simplifying x = 1.084348079

Subproblem 2

x + 1.653571429 = -2.737919508 Simplifying x + 1.653571429 = -2.737919508 Reorder the terms: 1.653571429 + x = -2.737919508 Solving 1.653571429 + x = -2.737919508 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.653571429' to each side of the equation. 1.653571429 + -1.653571429 + x = -2.737919508 + -1.653571429 Combine like terms: 1.653571429 + -1.653571429 = 0.000000000 0.000000000 + x = -2.737919508 + -1.653571429 x = -2.737919508 + -1.653571429 Combine like terms: -2.737919508 + -1.653571429 = -4.391490937 x = -4.391490937 Simplifying x = -4.391490937

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.084348079, -4.391490937}

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