3x+16=4x(8x-7)

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Solution for 3x+16=4x(8x-7) equation:


Simplifying
3x + 16 = 4x(8x + -7)

Reorder the terms:
16 + 3x = 4x(8x + -7)

Reorder the terms:
16 + 3x = 4x(-7 + 8x)
16 + 3x = (-7 * 4x + 8x * 4x)
16 + 3x = (-28x + 32x2)

Solving
16 + 3x = -28x + 32x2

Solving for variable 'x'.

Combine like terms: 3x + 28x = 31x
16 + 31x + -32x2 = -28x + 32x2 + 28x + -32x2

Reorder the terms:
16 + 31x + -32x2 = -28x + 28x + 32x2 + -32x2

Combine like terms: -28x + 28x = 0
16 + 31x + -32x2 = 0 + 32x2 + -32x2
16 + 31x + -32x2 = 32x2 + -32x2

Combine like terms: 32x2 + -32x2 = 0
16 + 31x + -32x2 = 0

Begin completing the square.  Divide all terms by
-32 the coefficient of the squared term: 

Divide each side by '-32'.
-0.5 + -0.96875x + x2 = 0

Move the constant term to the right:

Add '0.5' to each side of the equation.
-0.5 + -0.96875x + 0.5 + x2 = 0 + 0.5

Reorder the terms:
-0.5 + 0.5 + -0.96875x + x2 = 0 + 0.5

Combine like terms: -0.5 + 0.5 = 0.0
0.0 + -0.96875x + x2 = 0 + 0.5
-0.96875x + x2 = 0 + 0.5

Combine like terms: 0 + 0.5 = 0.5
-0.96875x + x2 = 0.5

The x term is -0.96875x.  Take half its coefficient (-0.484375).
Square it (0.2346191406) and add it to both sides.

Add '0.2346191406' to each side of the equation.
-0.96875x + 0.2346191406 + x2 = 0.5 + 0.2346191406

Reorder the terms:
0.2346191406 + -0.96875x + x2 = 0.5 + 0.2346191406

Combine like terms: 0.5 + 0.2346191406 = 0.7346191406
0.2346191406 + -0.96875x + x2 = 0.7346191406

Factor a perfect square on the left side:
(x + -0.484375)(x + -0.484375) = 0.7346191406

Calculate the square root of the right side: 0.857099259

Break this problem into two subproblems by setting 
(x + -0.484375) equal to 0.857099259 and -0.857099259.

Subproblem 1

x + -0.484375 = 0.857099259 Simplifying x + -0.484375 = 0.857099259 Reorder the terms: -0.484375 + x = 0.857099259 Solving -0.484375 + x = 0.857099259 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.484375' to each side of the equation. -0.484375 + 0.484375 + x = 0.857099259 + 0.484375 Combine like terms: -0.484375 + 0.484375 = 0.000000 0.000000 + x = 0.857099259 + 0.484375 x = 0.857099259 + 0.484375 Combine like terms: 0.857099259 + 0.484375 = 1.341474259 x = 1.341474259 Simplifying x = 1.341474259

Subproblem 2

x + -0.484375 = -0.857099259 Simplifying x + -0.484375 = -0.857099259 Reorder the terms: -0.484375 + x = -0.857099259 Solving -0.484375 + x = -0.857099259 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.484375' to each side of the equation. -0.484375 + 0.484375 + x = -0.857099259 + 0.484375 Combine like terms: -0.484375 + 0.484375 = 0.000000 0.000000 + x = -0.857099259 + 0.484375 x = -0.857099259 + 0.484375 Combine like terms: -0.857099259 + 0.484375 = -0.372724259 x = -0.372724259 Simplifying x = -0.372724259

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.341474259, -0.372724259}

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