(0.25x+3)(x)=160

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Solution for (0.25x+3)(x)=160 equation:


Simplifying
(0.25x + 3)(x) = 160

Reorder the terms:
(3 + 0.25x)(x) = 160

Reorder the terms for easier multiplication:
x(3 + 0.25x) = 160
(3 * x + 0.25x * x) = 160
(3x + 0.25x2) = 160

Solving
3x + 0.25x2 = 160

Solving for variable 'x'.

Reorder the terms:
-160 + 3x + 0.25x2 = 160 + -160

Combine like terms: 160 + -160 = 0
-160 + 3x + 0.25x2 = 0

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

Divide each side by '0.25'.
-640 + 12x + x2 = 0

Move the constant term to the right:

Add '640' to each side of the equation.
-640 + 12x + 640 + x2 = 0 + 640

Reorder the terms:
-640 + 640 + 12x + x2 = 0 + 640

Combine like terms: -640 + 640 = 0
0 + 12x + x2 = 0 + 640
12x + x2 = 0 + 640

Combine like terms: 0 + 640 = 640
12x + x2 = 640

The x term is 12x.  Take half its coefficient (6).
Square it (36) and add it to both sides.

Add '36' to each side of the equation.
12x + 36 + x2 = 640 + 36

Reorder the terms:
36 + 12x + x2 = 640 + 36

Combine like terms: 640 + 36 = 676
36 + 12x + x2 = 676

Factor a perfect square on the left side:
(x + 6)(x + 6) = 676

Calculate the square root of the right side: 26

Break this problem into two subproblems by setting 
(x + 6) equal to 26 and -26.

Subproblem 1

x + 6 = 26 Simplifying x + 6 = 26 Reorder the terms: 6 + x = 26 Solving 6 + x = 26 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = 26 + -6 Combine like terms: 6 + -6 = 0 0 + x = 26 + -6 x = 26 + -6 Combine like terms: 26 + -6 = 20 x = 20 Simplifying x = 20

Subproblem 2

x + 6 = -26 Simplifying x + 6 = -26 Reorder the terms: 6 + x = -26 Solving 6 + x = -26 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + x = -26 + -6 Combine like terms: 6 + -6 = 0 0 + x = -26 + -6 x = -26 + -6 Combine like terms: -26 + -6 = -32 x = -32 Simplifying x = -32

Solution

The solution to the problem is based on the solutions from the subproblems. x = {20, -32}

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