0=-0.01x^2-0.7x+5.1

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Solution for 0=-0.01x^2-0.7x+5.1 equation:


Simplifying
0 = -0.01x2 + -0.7x + 5.1

Reorder the terms:
0 = 5.1 + -0.7x + -0.01x2

Solving
0 = 5.1 + -0.7x + -0.01x2

Solving for variable 'x'.

Combine like terms: 0 + -5.1 = -5.1
-5.1 + 0.7x + 0.01x2 = 5.1 + -0.7x + -0.01x2 + -5.1 + 0.7x + 0.01x2

Reorder the terms:
-5.1 + 0.7x + 0.01x2 = 5.1 + -5.1 + -0.7x + 0.7x + -0.01x2 + 0.01x2

Combine like terms: 5.1 + -5.1 = 0.0
-5.1 + 0.7x + 0.01x2 = 0.0 + -0.7x + 0.7x + -0.01x2 + 0.01x2
-5.1 + 0.7x + 0.01x2 = -0.7x + 0.7x + -0.01x2 + 0.01x2

Combine like terms: -0.7x + 0.7x = 0.0
-5.1 + 0.7x + 0.01x2 = 0.0 + -0.01x2 + 0.01x2
-5.1 + 0.7x + 0.01x2 = -0.01x2 + 0.01x2

Combine like terms: -0.01x2 + 0.01x2 = 0.00
-5.1 + 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'.
-510 + 70x + x2 = 0

Move the constant term to the right:

Add '510' to each side of the equation.
-510 + 70x + 510 + x2 = 0 + 510

Reorder the terms:
-510 + 510 + 70x + x2 = 0 + 510

Combine like terms: -510 + 510 = 0
0 + 70x + x2 = 0 + 510
70x + x2 = 0 + 510

Combine like terms: 0 + 510 = 510
70x + x2 = 510

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 = 510 + 1225

Reorder the terms:
1225 + 70x + x2 = 510 + 1225

Combine like terms: 510 + 1225 = 1735
1225 + 70x + x2 = 1735

Factor a perfect square on the left side:
(x + 35)(x + 35) = 1735

Calculate the square root of the right side: 41.653331199

Break this problem into two subproblems by setting 
(x + 35) equal to 41.653331199 and -41.653331199.

Subproblem 1

x + 35 = 41.653331199 Simplifying x + 35 = 41.653331199 Reorder the terms: 35 + x = 41.653331199 Solving 35 + x = 41.653331199 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 = 41.653331199 + -35 Combine like terms: 35 + -35 = 0 0 + x = 41.653331199 + -35 x = 41.653331199 + -35 Combine like terms: 41.653331199 + -35 = 6.653331199 x = 6.653331199 Simplifying x = 6.653331199

Subproblem 2

x + 35 = -41.653331199 Simplifying x + 35 = -41.653331199 Reorder the terms: 35 + x = -41.653331199 Solving 35 + x = -41.653331199 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 = -41.653331199 + -35 Combine like terms: 35 + -35 = 0 0 + x = -41.653331199 + -35 x = -41.653331199 + -35 Combine like terms: -41.653331199 + -35 = -76.653331199 x = -76.653331199 Simplifying x = -76.653331199

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.653331199, -76.653331199}

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