8x^2+47x+28=

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Solution for 8x^2+47x+28= equation:


Simplifying
8x2 + 47x + 28 = 0

Reorder the terms:
28 + 47x + 8x2 = 0

Solving
28 + 47x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
3.5 + 5.875x + x2 = 0

Move the constant term to the right:

Add '-3.5' to each side of the equation.
3.5 + 5.875x + -3.5 + x2 = 0 + -3.5

Reorder the terms:
3.5 + -3.5 + 5.875x + x2 = 0 + -3.5

Combine like terms: 3.5 + -3.5 = 0.0
0.0 + 5.875x + x2 = 0 + -3.5
5.875x + x2 = 0 + -3.5

Combine like terms: 0 + -3.5 = -3.5
5.875x + x2 = -3.5

The x term is 5.875x.  Take half its coefficient (2.9375).
Square it (8.62890625) and add it to both sides.

Add '8.62890625' to each side of the equation.
5.875x + 8.62890625 + x2 = -3.5 + 8.62890625

Reorder the terms:
8.62890625 + 5.875x + x2 = -3.5 + 8.62890625

Combine like terms: -3.5 + 8.62890625 = 5.12890625
8.62890625 + 5.875x + x2 = 5.12890625

Factor a perfect square on the left side:
(x + 2.9375)(x + 2.9375) = 5.12890625

Calculate the square root of the right side: 2.264708866

Break this problem into two subproblems by setting 
(x + 2.9375) equal to 2.264708866 and -2.264708866.

Subproblem 1

x + 2.9375 = 2.264708866 Simplifying x + 2.9375 = 2.264708866 Reorder the terms: 2.9375 + x = 2.264708866 Solving 2.9375 + x = 2.264708866 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.9375' to each side of the equation. 2.9375 + -2.9375 + x = 2.264708866 + -2.9375 Combine like terms: 2.9375 + -2.9375 = 0.0000 0.0000 + x = 2.264708866 + -2.9375 x = 2.264708866 + -2.9375 Combine like terms: 2.264708866 + -2.9375 = -0.672791134 x = -0.672791134 Simplifying x = -0.672791134

Subproblem 2

x + 2.9375 = -2.264708866 Simplifying x + 2.9375 = -2.264708866 Reorder the terms: 2.9375 + x = -2.264708866 Solving 2.9375 + x = -2.264708866 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.9375' to each side of the equation. 2.9375 + -2.9375 + x = -2.264708866 + -2.9375 Combine like terms: 2.9375 + -2.9375 = 0.0000 0.0000 + x = -2.264708866 + -2.9375 x = -2.264708866 + -2.9375 Combine like terms: -2.264708866 + -2.9375 = -5.202208866 x = -5.202208866 Simplifying x = -5.202208866

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-0.672791134, -5.202208866}

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