0=.01x^2+.7x+6.1

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Solution for 0=.01x^2+.7x+6.1 equation:


Simplifying
0 = 0.01x2 + 0.7x + 6.1

Reorder the terms:
0 = 6.1 + 0.7x + 0.01x2

Solving
0 = 6.1 + 0.7x + 0.01x2

Solving for variable 'x'.

Combine like terms: 0 + -6.1 = -6.1
-6.1 + -0.7x + -0.01x2 = 6.1 + 0.7x + 0.01x2 + -6.1 + -0.7x + -0.01x2

Reorder the terms:
-6.1 + -0.7x + -0.01x2 = 6.1 + -6.1 + 0.7x + -0.7x + 0.01x2 + -0.01x2

Combine like terms: 6.1 + -6.1 = 0.0
-6.1 + -0.7x + -0.01x2 = 0.0 + 0.7x + -0.7x + 0.01x2 + -0.01x2
-6.1 + -0.7x + -0.01x2 = 0.7x + -0.7x + 0.01x2 + -0.01x2

Combine like terms: 0.7x + -0.7x = 0.0
-6.1 + -0.7x + -0.01x2 = 0.0 + 0.01x2 + -0.01x2
-6.1 + -0.7x + -0.01x2 = 0.01x2 + -0.01x2

Combine like terms: 0.01x2 + -0.01x2 = 0.00
-6.1 + -0.7x + -0.01x2 = 0.00

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
610 + 70x + x2 = 0

Move the constant term to the right:

Add '-610' to each side of the equation.
610 + 70x + -610 + x2 = 0 + -610

Reorder the terms:
610 + -610 + 70x + x2 = 0 + -610

Combine like terms: 610 + -610 = 0
0 + 70x + x2 = 0 + -610
70x + x2 = 0 + -610

Combine like terms: 0 + -610 = -610
70x + x2 = -610

The x term is 70x.  Take half its coefficient (35).
Square it (1225) and add it to both sides.

Add '1225' to each side of the equation.
70x + 1225 + x2 = -610 + 1225

Reorder the terms:
1225 + 70x + x2 = -610 + 1225

Combine like terms: -610 + 1225 = 615
1225 + 70x + x2 = 615

Factor a perfect square on the left side:
(x + 35)(x + 35) = 615

Calculate the square root of the right side: 24.799193535

Break this problem into two subproblems by setting 
(x + 35) equal to 24.799193535 and -24.799193535.

Subproblem 1

x + 35 = 24.799193535 Simplifying x + 35 = 24.799193535 Reorder the terms: 35 + x = 24.799193535 Solving 35 + x = 24.799193535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = 24.799193535 + -35 Combine like terms: 35 + -35 = 0 0 + x = 24.799193535 + -35 x = 24.799193535 + -35 Combine like terms: 24.799193535 + -35 = -10.200806465 x = -10.200806465 Simplifying x = -10.200806465

Subproblem 2

x + 35 = -24.799193535 Simplifying x + 35 = -24.799193535 Reorder the terms: 35 + x = -24.799193535 Solving 35 + x = -24.799193535 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-35' to each side of the equation. 35 + -35 + x = -24.799193535 + -35 Combine like terms: 35 + -35 = 0 0 + x = -24.799193535 + -35 x = -24.799193535 + -35 Combine like terms: -24.799193535 + -35 = -59.799193535 x = -59.799193535 Simplifying x = -59.799193535

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-10.200806465, -59.799193535}

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