10.5=.7x^2-4.3x

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Solution for 10.5=.7x^2-4.3x equation:


Simplifying
10.5 = 0.7x2 + -4.3x

Reorder the terms:
10.5 = -4.3x + 0.7x2

Solving
10.5 = -4.3x + 0.7x2

Solving for variable 'x'.

Reorder the terms:
10.5 + 4.3x + -0.7x2 = -4.3x + 4.3x + 0.7x2 + -0.7x2

Combine like terms: -4.3x + 4.3x = 0.0
10.5 + 4.3x + -0.7x2 = 0.0 + 0.7x2 + -0.7x2
10.5 + 4.3x + -0.7x2 = 0.7x2 + -0.7x2

Combine like terms: 0.7x2 + -0.7x2 = 0.0
10.5 + 4.3x + -0.7x2 = 0.0

Begin completing the square.  Divide all terms by
-0.7 the coefficient of the squared term: 

Divide each side by '-0.7'.
-15 + -6.142857143x + x2 = 0

Move the constant term to the right:

Add '15' to each side of the equation.
-15 + -6.142857143x + 15 + x2 = 0 + 15

Reorder the terms:
-15 + 15 + -6.142857143x + x2 = 0 + 15

Combine like terms: -15 + 15 = 0
0 + -6.142857143x + x2 = 0 + 15
-6.142857143x + x2 = 0 + 15

Combine like terms: 0 + 15 = 15
-6.142857143x + x2 = 15

The x term is -6.142857143x.  Take half its coefficient (-3.071428572).
Square it (9.433673473) and add it to both sides.

Add '9.433673473' to each side of the equation.
-6.142857143x + 9.433673473 + x2 = 15 + 9.433673473

Reorder the terms:
9.433673473 + -6.142857143x + x2 = 15 + 9.433673473

Combine like terms: 15 + 9.433673473 = 24.433673473
9.433673473 + -6.142857143x + x2 = 24.433673473

Factor a perfect square on the left side:
(x + -3.071428572)(x + -3.071428572) = 24.433673473

Calculate the square root of the right side: 4.943042937

Break this problem into two subproblems by setting 
(x + -3.071428572) equal to 4.943042937 and -4.943042937.

Subproblem 1

x + -3.071428572 = 4.943042937 Simplifying x + -3.071428572 = 4.943042937 Reorder the terms: -3.071428572 + x = 4.943042937 Solving -3.071428572 + x = 4.943042937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.071428572' to each side of the equation. -3.071428572 + 3.071428572 + x = 4.943042937 + 3.071428572 Combine like terms: -3.071428572 + 3.071428572 = 0.000000000 0.000000000 + x = 4.943042937 + 3.071428572 x = 4.943042937 + 3.071428572 Combine like terms: 4.943042937 + 3.071428572 = 8.014471509 x = 8.014471509 Simplifying x = 8.014471509

Subproblem 2

x + -3.071428572 = -4.943042937 Simplifying x + -3.071428572 = -4.943042937 Reorder the terms: -3.071428572 + x = -4.943042937 Solving -3.071428572 + x = -4.943042937 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.071428572' to each side of the equation. -3.071428572 + 3.071428572 + x = -4.943042937 + 3.071428572 Combine like terms: -3.071428572 + 3.071428572 = 0.000000000 0.000000000 + x = -4.943042937 + 3.071428572 x = -4.943042937 + 3.071428572 Combine like terms: -4.943042937 + 3.071428572 = -1.871614365 x = -1.871614365 Simplifying x = -1.871614365

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.014471509, -1.871614365}

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