-4.9x^2+7.4x+10.9=0

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Solution for -4.9x^2+7.4x+10.9=0 equation:


Simplifying
-4.9x2 + 7.4x + 10.9 = 0

Reorder the terms:
10.9 + 7.4x + -4.9x2 = 0

Solving
10.9 + 7.4x + -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'.
-2.224489796 + -1.510204082x + x2 = 0

Move the constant term to the right:

Add '2.224489796' to each side of the equation.
-2.224489796 + -1.510204082x + 2.224489796 + x2 = 0 + 2.224489796

Reorder the terms:
-2.224489796 + 2.224489796 + -1.510204082x + x2 = 0 + 2.224489796

Combine like terms: -2.224489796 + 2.224489796 = 0.000000000
0.000000000 + -1.510204082x + x2 = 0 + 2.224489796
-1.510204082x + x2 = 0 + 2.224489796

Combine like terms: 0 + 2.224489796 = 2.224489796
-1.510204082x + x2 = 2.224489796

The x term is -1.510204082x.  Take half its coefficient (-0.755102041).
Square it (0.5701790923) and add it to both sides.

Add '0.5701790923' to each side of the equation.
-1.510204082x + 0.5701790923 + x2 = 2.224489796 + 0.5701790923

Reorder the terms:
0.5701790923 + -1.510204082x + x2 = 2.224489796 + 0.5701790923

Combine like terms: 2.224489796 + 0.5701790923 = 2.7946688883
0.5701790923 + -1.510204082x + x2 = 2.7946688883

Factor a perfect square on the left side:
(x + -0.755102041)(x + -0.755102041) = 2.7946688883

Calculate the square root of the right side: 1.67172632

Break this problem into two subproblems by setting 
(x + -0.755102041) equal to 1.67172632 and -1.67172632.

Subproblem 1

x + -0.755102041 = 1.67172632 Simplifying x + -0.755102041 = 1.67172632 Reorder the terms: -0.755102041 + x = 1.67172632 Solving -0.755102041 + x = 1.67172632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.755102041' to each side of the equation. -0.755102041 + 0.755102041 + x = 1.67172632 + 0.755102041 Combine like terms: -0.755102041 + 0.755102041 = 0.000000000 0.000000000 + x = 1.67172632 + 0.755102041 x = 1.67172632 + 0.755102041 Combine like terms: 1.67172632 + 0.755102041 = 2.426828361 x = 2.426828361 Simplifying x = 2.426828361

Subproblem 2

x + -0.755102041 = -1.67172632 Simplifying x + -0.755102041 = -1.67172632 Reorder the terms: -0.755102041 + x = -1.67172632 Solving -0.755102041 + x = -1.67172632 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.755102041' to each side of the equation. -0.755102041 + 0.755102041 + x = -1.67172632 + 0.755102041 Combine like terms: -0.755102041 + 0.755102041 = 0.000000000 0.000000000 + x = -1.67172632 + 0.755102041 x = -1.67172632 + 0.755102041 Combine like terms: -1.67172632 + 0.755102041 = -0.916624279 x = -0.916624279 Simplifying x = -0.916624279

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.426828361, -0.916624279}

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