(4x+3)(x)=320

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Solution for (4x+3)(x)=320 equation:


Simplifying
(4x + 3)(x) = 320

Reorder the terms:
(3 + 4x)(x) = 320

Reorder the terms for easier multiplication:
x(3 + 4x) = 320
(3 * x + 4x * x) = 320
(3x + 4x2) = 320

Solving
3x + 4x2 = 320

Solving for variable 'x'.

Reorder the terms:
-320 + 3x + 4x2 = 320 + -320

Combine like terms: 320 + -320 = 0
-320 + 3x + 4x2 = 0

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

Divide each side by '4'.
-80 + 0.75x + x2 = 0

Move the constant term to the right:

Add '80' to each side of the equation.
-80 + 0.75x + 80 + x2 = 0 + 80

Reorder the terms:
-80 + 80 + 0.75x + x2 = 0 + 80

Combine like terms: -80 + 80 = 0
0 + 0.75x + x2 = 0 + 80
0.75x + x2 = 0 + 80

Combine like terms: 0 + 80 = 80
0.75x + x2 = 80

The x term is 0.75x.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75x + 0.140625 + x2 = 80 + 0.140625

Reorder the terms:
0.140625 + 0.75x + x2 = 80 + 0.140625

Combine like terms: 80 + 0.140625 = 80.140625
0.140625 + 0.75x + x2 = 80.140625

Factor a perfect square on the left side:
(x + 0.375)(x + 0.375) = 80.140625

Calculate the square root of the right side: 8.952129635

Break this problem into two subproblems by setting 
(x + 0.375) equal to 8.952129635 and -8.952129635.

Subproblem 1

x + 0.375 = 8.952129635 Simplifying x + 0.375 = 8.952129635 Reorder the terms: 0.375 + x = 8.952129635 Solving 0.375 + x = 8.952129635 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = 8.952129635 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = 8.952129635 + -0.375 x = 8.952129635 + -0.375 Combine like terms: 8.952129635 + -0.375 = 8.577129635 x = 8.577129635 Simplifying x = 8.577129635

Subproblem 2

x + 0.375 = -8.952129635 Simplifying x + 0.375 = -8.952129635 Reorder the terms: 0.375 + x = -8.952129635 Solving 0.375 + x = -8.952129635 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + x = -8.952129635 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + x = -8.952129635 + -0.375 x = -8.952129635 + -0.375 Combine like terms: -8.952129635 + -0.375 = -9.327129635 x = -9.327129635 Simplifying x = -9.327129635

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.577129635, -9.327129635}

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