-7x+8-10x^2=7

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Solution for -7x+8-10x^2=7 equation:


Simplifying
-7x + 8 + -10x2 = 7

Reorder the terms:
8 + -7x + -10x2 = 7

Solving
8 + -7x + -10x2 = 7

Solving for variable 'x'.

Reorder the terms:
8 + -7 + -7x + -10x2 = 7 + -7

Combine like terms: 8 + -7 = 1
1 + -7x + -10x2 = 7 + -7

Combine like terms: 7 + -7 = 0
1 + -7x + -10x2 = 0

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

Divide each side by '-10'.
-0.1 + 0.7x + x2 = 0

Move the constant term to the right:

Add '0.1' to each side of the equation.
-0.1 + 0.7x + 0.1 + x2 = 0 + 0.1

Reorder the terms:
-0.1 + 0.1 + 0.7x + x2 = 0 + 0.1

Combine like terms: -0.1 + 0.1 = 0.0
0.0 + 0.7x + x2 = 0 + 0.1
0.7x + x2 = 0 + 0.1

Combine like terms: 0 + 0.1 = 0.1
0.7x + x2 = 0.1

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 = 0.1 + 0.1225

Reorder the terms:
0.1225 + 0.7x + x2 = 0.1 + 0.1225

Combine like terms: 0.1 + 0.1225 = 0.2225
0.1225 + 0.7x + x2 = 0.2225

Factor a perfect square on the left side:
(x + 0.35)(x + 0.35) = 0.2225

Calculate the square root of the right side: 0.471699057

Break this problem into two subproblems by setting 
(x + 0.35) equal to 0.471699057 and -0.471699057.

Subproblem 1

x + 0.35 = 0.471699057 Simplifying x + 0.35 = 0.471699057 Reorder the terms: 0.35 + x = 0.471699057 Solving 0.35 + x = 0.471699057 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 = 0.471699057 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = 0.471699057 + -0.35 x = 0.471699057 + -0.35 Combine like terms: 0.471699057 + -0.35 = 0.121699057 x = 0.121699057 Simplifying x = 0.121699057

Subproblem 2

x + 0.35 = -0.471699057 Simplifying x + 0.35 = -0.471699057 Reorder the terms: 0.35 + x = -0.471699057 Solving 0.35 + x = -0.471699057 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 = -0.471699057 + -0.35 Combine like terms: 0.35 + -0.35 = 0.00 0.00 + x = -0.471699057 + -0.35 x = -0.471699057 + -0.35 Combine like terms: -0.471699057 + -0.35 = -0.821699057 x = -0.821699057 Simplifying x = -0.821699057

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.121699057, -0.821699057}

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