.04(x^2)+.8x=60

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Solution for .04(x^2)+.8x=60 equation:


Simplifying
0.04(x2) + 0.8x = 60

Reorder the terms:
0.8x + 0.04x2 = 60

Solving
0.8x + 0.04x2 = 60

Solving for variable 'x'.

Reorder the terms:
-60 + 0.8x + 0.04x2 = 60 + -60

Combine like terms: 60 + -60 = 0
-60 + 0.8x + 0.04x2 = 0

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

Divide each side by '0.04'.
-1500 + 20x + x2 = 0

Move the constant term to the right:

Add '1500' to each side of the equation.
-1500 + 20x + 1500 + x2 = 0 + 1500

Reorder the terms:
-1500 + 1500 + 20x + x2 = 0 + 1500

Combine like terms: -1500 + 1500 = 0
0 + 20x + x2 = 0 + 1500
20x + x2 = 0 + 1500

Combine like terms: 0 + 1500 = 1500
20x + x2 = 1500

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = 1500 + 100

Reorder the terms:
100 + 20x + x2 = 1500 + 100

Combine like terms: 1500 + 100 = 1600
100 + 20x + x2 = 1600

Factor a perfect square on the left side:
(x + 10)(x + 10) = 1600

Calculate the square root of the right side: 40

Break this problem into two subproblems by setting 
(x + 10) equal to 40 and -40.

Subproblem 1

x + 10 = 40 Simplifying x + 10 = 40 Reorder the terms: 10 + x = 40 Solving 10 + x = 40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 40 + -10 Combine like terms: 10 + -10 = 0 0 + x = 40 + -10 x = 40 + -10 Combine like terms: 40 + -10 = 30 x = 30 Simplifying x = 30

Subproblem 2

x + 10 = -40 Simplifying x + 10 = -40 Reorder the terms: 10 + x = -40 Solving 10 + x = -40 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -40 + -10 Combine like terms: 10 + -10 = 0 0 + x = -40 + -10 x = -40 + -10 Combine like terms: -40 + -10 = -50 x = -50 Simplifying x = -50

Solution

The solution to the problem is based on the solutions from the subproblems. x = {30, -50}

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