5x^2+4x=196

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Solution for 5x^2+4x=196 equation:


Simplifying
5x2 + 4x = 196

Reorder the terms:
4x + 5x2 = 196

Solving
4x + 5x2 = 196

Solving for variable 'x'.

Reorder the terms:
-196 + 4x + 5x2 = 196 + -196

Combine like terms: 196 + -196 = 0
-196 + 4x + 5x2 = 0

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

Divide each side by '5'.
-39.2 + 0.8x + x2 = 0

Move the constant term to the right:

Add '39.2' to each side of the equation.
-39.2 + 0.8x + 39.2 + x2 = 0 + 39.2

Reorder the terms:
-39.2 + 39.2 + 0.8x + x2 = 0 + 39.2

Combine like terms: -39.2 + 39.2 = 0.0
0.0 + 0.8x + x2 = 0 + 39.2
0.8x + x2 = 0 + 39.2

Combine like terms: 0 + 39.2 = 39.2
0.8x + x2 = 39.2

The x term is 0.8x.  Take half its coefficient (0.4).
Square it (0.16) and add it to both sides.

Add '0.16' to each side of the equation.
0.8x + 0.16 + x2 = 39.2 + 0.16

Reorder the terms:
0.16 + 0.8x + x2 = 39.2 + 0.16

Combine like terms: 39.2 + 0.16 = 39.36
0.16 + 0.8x + x2 = 39.36

Factor a perfect square on the left side:
(x + 0.4)(x + 0.4) = 39.36

Calculate the square root of the right side: 6.273754857

Break this problem into two subproblems by setting 
(x + 0.4) equal to 6.273754857 and -6.273754857.

Subproblem 1

x + 0.4 = 6.273754857 Simplifying x + 0.4 = 6.273754857 Reorder the terms: 0.4 + x = 6.273754857 Solving 0.4 + x = 6.273754857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = 6.273754857 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = 6.273754857 + -0.4 x = 6.273754857 + -0.4 Combine like terms: 6.273754857 + -0.4 = 5.873754857 x = 5.873754857 Simplifying x = 5.873754857

Subproblem 2

x + 0.4 = -6.273754857 Simplifying x + 0.4 = -6.273754857 Reorder the terms: 0.4 + x = -6.273754857 Solving 0.4 + x = -6.273754857 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.4' to each side of the equation. 0.4 + -0.4 + x = -6.273754857 + -0.4 Combine like terms: 0.4 + -0.4 = 0.0 0.0 + x = -6.273754857 + -0.4 x = -6.273754857 + -0.4 Combine like terms: -6.273754857 + -0.4 = -6.673754857 x = -6.673754857 Simplifying x = -6.673754857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.873754857, -6.673754857}

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