16000000=.7x^2-4.3x+5.5

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Solution for 16000000=.7x^2-4.3x+5.5 equation:


Simplifying
16000000 = 0.7x2 + -4.3x + 5.5

Reorder the terms:
16000000 = 5.5 + -4.3x + 0.7x2

Solving
16000000 = 5.5 + -4.3x + 0.7x2

Solving for variable 'x'.

Combine like terms: 16000000 + -5.5 = 15999994.5
15999994.5 + 4.3x + -0.7x2 = 5.5 + -4.3x + 0.7x2 + -5.5 + 4.3x + -0.7x2

Reorder the terms:
15999994.5 + 4.3x + -0.7x2 = 5.5 + -5.5 + -4.3x + 4.3x + 0.7x2 + -0.7x2

Combine like terms: 5.5 + -5.5 = 0.0
15999994.5 + 4.3x + -0.7x2 = 0.0 + -4.3x + 4.3x + 0.7x2 + -0.7x2
15999994.5 + 4.3x + -0.7x2 = -4.3x + 4.3x + 0.7x2 + -0.7x2

Combine like terms: -4.3x + 4.3x = 0.0
15999994.5 + 4.3x + -0.7x2 = 0.0 + 0.7x2 + -0.7x2
15999994.5 + 4.3x + -0.7x2 = 0.7x2 + -0.7x2

Combine like terms: 0.7x2 + -0.7x2 = 0.0
15999994.5 + 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'.
-22857135 + -6.142857143x + x2 = 0

Move the constant term to the right:

Add '22857135' to each side of the equation.
-22857135 + -6.142857143x + 22857135 + x2 = 0 + 22857135

Reorder the terms:
-22857135 + 22857135 + -6.142857143x + x2 = 0 + 22857135

Combine like terms: -22857135 + 22857135 = 0
0 + -6.142857143x + x2 = 0 + 22857135
-6.142857143x + x2 = 0 + 22857135

Combine like terms: 0 + 22857135 = 22857135
-6.142857143x + x2 = 22857135

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 = 22857135 + 9.433673473

Reorder the terms:
9.433673473 + -6.142857143x + x2 = 22857135 + 9.433673473

Combine like terms: 22857135 + 9.433673473 = 22857144.433673473
9.433673473 + -6.142857143x + x2 = 22857144.433673473

Factor a perfect square on the left side:
(x + -3.071428572)(x + -3.071428572) = 22857144.433673473

Calculate the square root of the right side: 4780.914602215

Break this problem into two subproblems by setting 
(x + -3.071428572) equal to 4780.914602215 and -4780.914602215.

Subproblem 1

x + -3.071428572 = 4780.914602215 Simplifying x + -3.071428572 = 4780.914602215 Reorder the terms: -3.071428572 + x = 4780.914602215 Solving -3.071428572 + x = 4780.914602215 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 = 4780.914602215 + 3.071428572 Combine like terms: -3.071428572 + 3.071428572 = 0.000000000 0.000000000 + x = 4780.914602215 + 3.071428572 x = 4780.914602215 + 3.071428572 Combine like terms: 4780.914602215 + 3.071428572 = 4783.986030787 x = 4783.986030787 Simplifying x = 4783.986030787

Subproblem 2

x + -3.071428572 = -4780.914602215 Simplifying x + -3.071428572 = -4780.914602215 Reorder the terms: -3.071428572 + x = -4780.914602215 Solving -3.071428572 + x = -4780.914602215 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 = -4780.914602215 + 3.071428572 Combine like terms: -3.071428572 + 3.071428572 = 0.000000000 0.000000000 + x = -4780.914602215 + 3.071428572 x = -4780.914602215 + 3.071428572 Combine like terms: -4780.914602215 + 3.071428572 = -4777.843173643 x = -4777.843173643 Simplifying x = -4777.843173643

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4783.986030787, -4777.843173643}

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