-10x^2+7x+7=0

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Solution for -10x^2+7x+7=0 equation:


Simplifying
-10x2 + 7x + 7 = 0

Reorder the terms:
7 + 7x + -10x2 = 0

Solving
7 + 7x + -10x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-0.7 + -0.7x + x2 = 0

Move the constant term to the right:

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

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

Combine like terms: -0.7 + 0.7 = 0.0
0.0 + -0.7x + x2 = 0 + 0.7
-0.7x + x2 = 0 + 0.7

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

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 = 0.7 + 0.1225

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

Combine like terms: 0.7 + 0.1225 = 0.8225
0.1225 + -0.7x + x2 = 0.8225

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 0.8225

Calculate the square root of the right side: 0.906917857

Break this problem into two subproblems by setting 
(x + -0.35) equal to 0.906917857 and -0.906917857.

Subproblem 1

x + -0.35 = 0.906917857 Simplifying x + -0.35 = 0.906917857 Reorder the terms: -0.35 + x = 0.906917857 Solving -0.35 + x = 0.906917857 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 = 0.906917857 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 0.906917857 + 0.35 x = 0.906917857 + 0.35 Combine like terms: 0.906917857 + 0.35 = 1.256917857 x = 1.256917857 Simplifying x = 1.256917857

Subproblem 2

x + -0.35 = -0.906917857 Simplifying x + -0.35 = -0.906917857 Reorder the terms: -0.35 + x = -0.906917857 Solving -0.35 + x = -0.906917857 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 = -0.906917857 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -0.906917857 + 0.35 x = -0.906917857 + 0.35 Combine like terms: -0.906917857 + 0.35 = -0.556917857 x = -0.556917857 Simplifying x = -0.556917857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.256917857, -0.556917857}

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