-x^2-.7x+.1988=0

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Solution for -x^2-.7x+.1988=0 equation:


Simplifying
-1x2 + -0.7x + 0.1988 = 0

Reorder the terms:
0.1988 + -0.7x + -1x2 = 0

Solving
0.1988 + -0.7x + -1x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-0.1988 + 0.7x + x2 = 0

Move the constant term to the right:

Add '0.1988' to each side of the equation.
-0.1988 + 0.7x + 0.1988 + x2 = 0 + 0.1988

Reorder the terms:
-0.1988 + 0.1988 + 0.7x + x2 = 0 + 0.1988

Combine like terms: -0.1988 + 0.1988 = 0.0000
0.0000 + 0.7x + x2 = 0 + 0.1988
0.7x + x2 = 0 + 0.1988

Combine like terms: 0 + 0.1988 = 0.1988
0.7x + x2 = 0.1988

The x term is 0.7x.  Take half its coefficient (0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
0.7x + 0.1225 + x2 = 0.1988 + 0.1225

Reorder the terms:
0.1225 + 0.7x + x2 = 0.1988 + 0.1225

Combine like terms: 0.1988 + 0.1225 = 0.3213
0.1225 + 0.7x + x2 = 0.3213

Factor a perfect square on the left side:
(x + 0.35)(x + 0.35) = 0.3213

Calculate the square root of the right side: 0.566833309

Break this problem into two subproblems by setting 
(x + 0.35) equal to 0.566833309 and -0.566833309.

Subproblem 1

x + 0.35 = 0.566833309 Simplifying x + 0.35 = 0.566833309 Reorder the terms: 0.35 + x = 0.566833309 Solving 0.35 + x = 0.566833309 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = 0.566833309 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = 0.566833309 + -0.35 x = 0.566833309 + -0.35 Combine like terms: 0.566833309 + -0.35 = 0.216833309 x = 0.216833309 Simplifying x = 0.216833309

Subproblem 2

x + 0.35 = -0.566833309 Simplifying x + 0.35 = -0.566833309 Reorder the terms: 0.35 + x = -0.566833309 Solving 0.35 + x = -0.566833309 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.35' to each side of the equation. 0.35 + -0.35 + x = -0.566833309 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = -0.566833309 + -0.35 x = -0.566833309 + -0.35 Combine like terms: -0.566833309 + -0.35 = -0.916833309 x = -0.916833309 Simplifying x = -0.916833309

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.216833309, -0.916833309}

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