4(x+4)+5x(5x)=161

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Solution for 4(x+4)+5x(5x)=161 equation:


Simplifying
4(x + 4) + 5x(5x) = 161

Reorder the terms:
4(4 + x) + 5x(5x) = 161
(4 * 4 + x * 4) + 5x(5x) = 161
(16 + 4x) + 5x(5x) = 161

Remove parenthesis around (5x)
16 + 4x + 5x * 5x = 161

Reorder the terms for easier multiplication:
16 + 4x + 5 * 5x * x = 161

Multiply 5 * 5
16 + 4x + 25x * x = 161

Multiply x * x
16 + 4x + 25x2 = 161

Solving
16 + 4x + 25x2 = 161

Solving for variable 'x'.

Reorder the terms:
16 + -161 + 4x + 25x2 = 161 + -161

Combine like terms: 16 + -161 = -145
-145 + 4x + 25x2 = 161 + -161

Combine like terms: 161 + -161 = 0
-145 + 4x + 25x2 = 0

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

Divide each side by '25'.
-5.8 + 0.16x + x2 = 0

Move the constant term to the right:

Add '5.8' to each side of the equation.
-5.8 + 0.16x + 5.8 + x2 = 0 + 5.8

Reorder the terms:
-5.8 + 5.8 + 0.16x + x2 = 0 + 5.8

Combine like terms: -5.8 + 5.8 = 0.0
0.0 + 0.16x + x2 = 0 + 5.8
0.16x + x2 = 0 + 5.8

Combine like terms: 0 + 5.8 = 5.8
0.16x + x2 = 5.8

The x term is 0.16x.  Take half its coefficient (0.08).
Square it (0.0064) and add it to both sides.

Add '0.0064' to each side of the equation.
0.16x + 0.0064 + x2 = 5.8 + 0.0064

Reorder the terms:
0.0064 + 0.16x + x2 = 5.8 + 0.0064

Combine like terms: 5.8 + 0.0064 = 5.8064
0.0064 + 0.16x + x2 = 5.8064

Factor a perfect square on the left side:
(x + 0.08)(x + 0.08) = 5.8064

Calculate the square root of the right side: 2.409647277

Break this problem into two subproblems by setting 
(x + 0.08) equal to 2.409647277 and -2.409647277.

Subproblem 1

x + 0.08 = 2.409647277 Simplifying x + 0.08 = 2.409647277 Reorder the terms: 0.08 + x = 2.409647277 Solving 0.08 + x = 2.409647277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08' to each side of the equation. 0.08 + -0.08 + x = 2.409647277 + -0.08 Combine like terms: 0.08 + -0.08 = 0.00 0.00 + x = 2.409647277 + -0.08 x = 2.409647277 + -0.08 Combine like terms: 2.409647277 + -0.08 = 2.329647277 x = 2.329647277 Simplifying x = 2.329647277

Subproblem 2

x + 0.08 = -2.409647277 Simplifying x + 0.08 = -2.409647277 Reorder the terms: 0.08 + x = -2.409647277 Solving 0.08 + x = -2.409647277 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.08' to each side of the equation. 0.08 + -0.08 + x = -2.409647277 + -0.08 Combine like terms: 0.08 + -0.08 = 0.00 0.00 + x = -2.409647277 + -0.08 x = -2.409647277 + -0.08 Combine like terms: -2.409647277 + -0.08 = -2.489647277 x = -2.489647277 Simplifying x = -2.489647277

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.329647277, -2.489647277}

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