2x+5x^2-16x+5=0

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Solution for 2x+5x^2-16x+5=0 equation:


Simplifying
2x + 5x2 + -16x + 5 = 0

Reorder the terms:
5 + 2x + -16x + 5x2 = 0

Combine like terms: 2x + -16x = -14x
5 + -14x + 5x2 = 0

Solving
5 + -14x + 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'.
1 + -2.8x + x2 = 0

Move the constant term to the right:

Add '-1' to each side of the equation.
1 + -2.8x + -1 + x2 = 0 + -1

Reorder the terms:
1 + -1 + -2.8x + x2 = 0 + -1

Combine like terms: 1 + -1 = 0
0 + -2.8x + x2 = 0 + -1
-2.8x + x2 = 0 + -1

Combine like terms: 0 + -1 = -1
-2.8x + x2 = -1

The x term is -2.8x.  Take half its coefficient (-1.4).
Square it (1.96) and add it to both sides.

Add '1.96' to each side of the equation.
-2.8x + 1.96 + x2 = -1 + 1.96

Reorder the terms:
1.96 + -2.8x + x2 = -1 + 1.96

Combine like terms: -1 + 1.96 = 0.96
1.96 + -2.8x + x2 = 0.96

Factor a perfect square on the left side:
(x + -1.4)(x + -1.4) = 0.96

Calculate the square root of the right side: 0.979795897

Break this problem into two subproblems by setting 
(x + -1.4) equal to 0.979795897 and -0.979795897.

Subproblem 1

x + -1.4 = 0.979795897 Simplifying x + -1.4 = 0.979795897 Reorder the terms: -1.4 + x = 0.979795897 Solving -1.4 + x = 0.979795897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = 0.979795897 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = 0.979795897 + 1.4 x = 0.979795897 + 1.4 Combine like terms: 0.979795897 + 1.4 = 2.379795897 x = 2.379795897 Simplifying x = 2.379795897

Subproblem 2

x + -1.4 = -0.979795897 Simplifying x + -1.4 = -0.979795897 Reorder the terms: -1.4 + x = -0.979795897 Solving -1.4 + x = -0.979795897 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.4' to each side of the equation. -1.4 + 1.4 + x = -0.979795897 + 1.4 Combine like terms: -1.4 + 1.4 = 0.0 0.0 + x = -0.979795897 + 1.4 x = -0.979795897 + 1.4 Combine like terms: -0.979795897 + 1.4 = 0.420204103 x = 0.420204103 Simplifying x = 0.420204103

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.379795897, 0.420204103}

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