-4.9x^2+10x+8=0

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Solution for -4.9x^2+10x+8=0 equation:


Simplifying
-4.9x2 + 10x + 8 = 0

Reorder the terms:
8 + 10x + -4.9x2 = 0

Solving
8 + 10x + -4.9x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-4.9 the coefficient of the squared term: 

Divide each side by '-4.9'.
-1.632653061 + -2.040816327x + x2 = 0

Move the constant term to the right:

Add '1.632653061' to each side of the equation.
-1.632653061 + -2.040816327x + 1.632653061 + x2 = 0 + 1.632653061

Reorder the terms:
-1.632653061 + 1.632653061 + -2.040816327x + x2 = 0 + 1.632653061

Combine like terms: -1.632653061 + 1.632653061 = 0.000000000
0.000000000 + -2.040816327x + x2 = 0 + 1.632653061
-2.040816327x + x2 = 0 + 1.632653061

Combine like terms: 0 + 1.632653061 = 1.632653061
-2.040816327x + x2 = 1.632653061

The x term is -2.040816327x.  Take half its coefficient (-1.020408164).
Square it (1.041232821) and add it to both sides.

Add '1.041232821' to each side of the equation.
-2.040816327x + 1.041232821 + x2 = 1.632653061 + 1.041232821

Reorder the terms:
1.041232821 + -2.040816327x + x2 = 1.632653061 + 1.041232821

Combine like terms: 1.632653061 + 1.041232821 = 2.673885882
1.041232821 + -2.040816327x + x2 = 2.673885882

Factor a perfect square on the left side:
(x + -1.020408164)(x + -1.020408164) = 2.673885882

Calculate the square root of the right side: 1.635202092

Break this problem into two subproblems by setting 
(x + -1.020408164) equal to 1.635202092 and -1.635202092.

Subproblem 1

x + -1.020408164 = 1.635202092 Simplifying x + -1.020408164 = 1.635202092 Reorder the terms: -1.020408164 + x = 1.635202092 Solving -1.020408164 + x = 1.635202092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + x = 1.635202092 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = 1.635202092 + 1.020408164 x = 1.635202092 + 1.020408164 Combine like terms: 1.635202092 + 1.020408164 = 2.655610256 x = 2.655610256 Simplifying x = 2.655610256

Subproblem 2

x + -1.020408164 = -1.635202092 Simplifying x + -1.020408164 = -1.635202092 Reorder the terms: -1.020408164 + x = -1.635202092 Solving -1.020408164 + x = -1.635202092 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.020408164' to each side of the equation. -1.020408164 + 1.020408164 + x = -1.635202092 + 1.020408164 Combine like terms: -1.020408164 + 1.020408164 = 0.000000000 0.000000000 + x = -1.635202092 + 1.020408164 x = -1.635202092 + 1.020408164 Combine like terms: -1.635202092 + 1.020408164 = -0.614793928 x = -0.614793928 Simplifying x = -0.614793928

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.655610256, -0.614793928}

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