8x^2+10x-3x^2-49=0

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Solution for 8x^2+10x-3x^2-49=0 equation:


Simplifying
8x2 + 10x + -3x2 + -49 = 0

Reorder the terms:
-49 + 10x + 8x2 + -3x2 = 0

Combine like terms: 8x2 + -3x2 = 5x2
-49 + 10x + 5x2 = 0

Solving
-49 + 10x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-9.8 + 2x + x2 = 0

Move the constant term to the right:

Add '9.8' to each side of the equation.
-9.8 + 2x + 9.8 + x2 = 0 + 9.8

Reorder the terms:
-9.8 + 9.8 + 2x + x2 = 0 + 9.8

Combine like terms: -9.8 + 9.8 = 0.0
0.0 + 2x + x2 = 0 + 9.8
2x + x2 = 0 + 9.8

Combine like terms: 0 + 9.8 = 9.8
2x + x2 = 9.8

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 9.8 + 1

Reorder the terms:
1 + 2x + x2 = 9.8 + 1

Combine like terms: 9.8 + 1 = 10.8
1 + 2x + x2 = 10.8

Factor a perfect square on the left side:
(x + 1)(x + 1) = 10.8

Calculate the square root of the right side: 3.286335345

Break this problem into two subproblems by setting 
(x + 1) equal to 3.286335345 and -3.286335345.

Subproblem 1

x + 1 = 3.286335345 Simplifying x + 1 = 3.286335345 Reorder the terms: 1 + x = 3.286335345 Solving 1 + x = 3.286335345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = 3.286335345 + -1 Combine like terms: 1 + -1 = 0 0 + x = 3.286335345 + -1 x = 3.286335345 + -1 Combine like terms: 3.286335345 + -1 = 2.286335345 x = 2.286335345 Simplifying x = 2.286335345

Subproblem 2

x + 1 = -3.286335345 Simplifying x + 1 = -3.286335345 Reorder the terms: 1 + x = -3.286335345 Solving 1 + x = -3.286335345 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1' to each side of the equation. 1 + -1 + x = -3.286335345 + -1 Combine like terms: 1 + -1 = 0 0 + x = -3.286335345 + -1 x = -3.286335345 + -1 Combine like terms: -3.286335345 + -1 = -4.286335345 x = -4.286335345 Simplifying x = -4.286335345

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.286335345, -4.286335345}

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