5x^2+16x=11

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Solution for 5x^2+16x=11 equation:


Simplifying
5x2 + 16x = 11

Reorder the terms:
16x + 5x2 = 11

Solving
16x + 5x2 = 11

Solving for variable 'x'.

Reorder the terms:
-11 + 16x + 5x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-11 + 16x + 5x2 = 0

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

Divide each side by '5'.
-2.2 + 3.2x + x2 = 0

Move the constant term to the right:

Add '2.2' to each side of the equation.
-2.2 + 3.2x + 2.2 + x2 = 0 + 2.2

Reorder the terms:
-2.2 + 2.2 + 3.2x + x2 = 0 + 2.2

Combine like terms: -2.2 + 2.2 = 0.0
0.0 + 3.2x + x2 = 0 + 2.2
3.2x + x2 = 0 + 2.2

Combine like terms: 0 + 2.2 = 2.2
3.2x + x2 = 2.2

The x term is 3.2x.  Take half its coefficient (1.6).
Square it (2.56) and add it to both sides.

Add '2.56' to each side of the equation.
3.2x + 2.56 + x2 = 2.2 + 2.56

Reorder the terms:
2.56 + 3.2x + x2 = 2.2 + 2.56

Combine like terms: 2.2 + 2.56 = 4.76
2.56 + 3.2x + x2 = 4.76

Factor a perfect square on the left side:
(x + 1.6)(x + 1.6) = 4.76

Calculate the square root of the right side: 2.181742423

Break this problem into two subproblems by setting 
(x + 1.6) equal to 2.181742423 and -2.181742423.

Subproblem 1

x + 1.6 = 2.181742423 Simplifying x + 1.6 = 2.181742423 Reorder the terms: 1.6 + x = 2.181742423 Solving 1.6 + x = 2.181742423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = 2.181742423 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = 2.181742423 + -1.6 x = 2.181742423 + -1.6 Combine like terms: 2.181742423 + -1.6 = 0.581742423 x = 0.581742423 Simplifying x = 0.581742423

Subproblem 2

x + 1.6 = -2.181742423 Simplifying x + 1.6 = -2.181742423 Reorder the terms: 1.6 + x = -2.181742423 Solving 1.6 + x = -2.181742423 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.6' to each side of the equation. 1.6 + -1.6 + x = -2.181742423 + -1.6 Combine like terms: 1.6 + -1.6 = 0.0 0.0 + x = -2.181742423 + -1.6 x = -2.181742423 + -1.6 Combine like terms: -2.181742423 + -1.6 = -3.781742423 x = -3.781742423 Simplifying x = -3.781742423

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.581742423, -3.781742423}

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