16x^2+24x+16=81

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Solution for 16x^2+24x+16=81 equation:


Simplifying
16x2 + 24x + 16 = 81

Reorder the terms:
16 + 24x + 16x2 = 81

Solving
16 + 24x + 16x2 = 81

Solving for variable 'x'.

Reorder the terms:
16 + -81 + 24x + 16x2 = 81 + -81

Combine like terms: 16 + -81 = -65
-65 + 24x + 16x2 = 81 + -81

Combine like terms: 81 + -81 = 0
-65 + 24x + 16x2 = 0

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

Divide each side by '16'.
-4.0625 + 1.5x + x2 = 0

Move the constant term to the right:

Add '4.0625' to each side of the equation.
-4.0625 + 1.5x + 4.0625 + x2 = 0 + 4.0625

Reorder the terms:
-4.0625 + 4.0625 + 1.5x + x2 = 0 + 4.0625

Combine like terms: -4.0625 + 4.0625 = 0.0000
0.0000 + 1.5x + x2 = 0 + 4.0625
1.5x + x2 = 0 + 4.0625

Combine like terms: 0 + 4.0625 = 4.0625
1.5x + x2 = 4.0625

The x term is 1.5x.  Take half its coefficient (0.75).
Square it (0.5625) and add it to both sides.

Add '0.5625' to each side of the equation.
1.5x + 0.5625 + x2 = 4.0625 + 0.5625

Reorder the terms:
0.5625 + 1.5x + x2 = 4.0625 + 0.5625

Combine like terms: 4.0625 + 0.5625 = 4.625
0.5625 + 1.5x + x2 = 4.625

Factor a perfect square on the left side:
(x + 0.75)(x + 0.75) = 4.625

Calculate the square root of the right side: 2.150581317

Break this problem into two subproblems by setting 
(x + 0.75) equal to 2.150581317 and -2.150581317.

Subproblem 1

x + 0.75 = 2.150581317 Simplifying x + 0.75 = 2.150581317 Reorder the terms: 0.75 + x = 2.150581317 Solving 0.75 + x = 2.150581317 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = 2.150581317 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = 2.150581317 + -0.75 x = 2.150581317 + -0.75 Combine like terms: 2.150581317 + -0.75 = 1.400581317 x = 1.400581317 Simplifying x = 1.400581317

Subproblem 2

x + 0.75 = -2.150581317 Simplifying x + 0.75 = -2.150581317 Reorder the terms: 0.75 + x = -2.150581317 Solving 0.75 + x = -2.150581317 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.75' to each side of the equation. 0.75 + -0.75 + x = -2.150581317 + -0.75 Combine like terms: 0.75 + -0.75 = 0.00 0.00 + x = -2.150581317 + -0.75 x = -2.150581317 + -0.75 Combine like terms: -2.150581317 + -0.75 = -2.900581317 x = -2.900581317 Simplifying x = -2.900581317

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.400581317, -2.900581317}

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