-.04x^2+2.1x+6.2=

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Solution for -.04x^2+2.1x+6.2= equation:


Simplifying
-0.04x2 + 2.1x + 6.2 = 0

Reorder the terms:
6.2 + 2.1x + -0.04x2 = 0

Solving
6.2 + 2.1x + -0.04x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.04 the coefficient of the squared term: 

Divide each side by '-0.04'.
-155 + -52.5x + x2 = 0

Move the constant term to the right:

Add '155' to each side of the equation.
-155 + -52.5x + 155 + x2 = 0 + 155

Reorder the terms:
-155 + 155 + -52.5x + x2 = 0 + 155

Combine like terms: -155 + 155 = 0
0 + -52.5x + x2 = 0 + 155
-52.5x + x2 = 0 + 155

Combine like terms: 0 + 155 = 155
-52.5x + x2 = 155

The x term is -52.5x.  Take half its coefficient (-26.25).
Square it (689.0625) and add it to both sides.

Add '689.0625' to each side of the equation.
-52.5x + 689.0625 + x2 = 155 + 689.0625

Reorder the terms:
689.0625 + -52.5x + x2 = 155 + 689.0625

Combine like terms: 155 + 689.0625 = 844.0625
689.0625 + -52.5x + x2 = 844.0625

Factor a perfect square on the left side:
(x + -26.25)(x + -26.25) = 844.0625

Calculate the square root of the right side: 29.052753742

Break this problem into two subproblems by setting 
(x + -26.25) equal to 29.052753742 and -29.052753742.

Subproblem 1

x + -26.25 = 29.052753742 Simplifying x + -26.25 = 29.052753742 Reorder the terms: -26.25 + x = 29.052753742 Solving -26.25 + x = 29.052753742 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '26.25' to each side of the equation. -26.25 + 26.25 + x = 29.052753742 + 26.25 Combine like terms: -26.25 + 26.25 = 0.00 0.00 + x = 29.052753742 + 26.25 x = 29.052753742 + 26.25 Combine like terms: 29.052753742 + 26.25 = 55.302753742 x = 55.302753742 Simplifying x = 55.302753742

Subproblem 2

x + -26.25 = -29.052753742 Simplifying x + -26.25 = -29.052753742 Reorder the terms: -26.25 + x = -29.052753742 Solving -26.25 + x = -29.052753742 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '26.25' to each side of the equation. -26.25 + 26.25 + x = -29.052753742 + 26.25 Combine like terms: -26.25 + 26.25 = 0.00 0.00 + x = -29.052753742 + 26.25 x = -29.052753742 + 26.25 Combine like terms: -29.052753742 + 26.25 = -2.802753742 x = -2.802753742 Simplifying x = -2.802753742

Solution

The solution to the problem is based on the solutions from the subproblems. x = {55.302753742, -2.802753742}

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