60=0.4x^2+0.5x

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Solution for 60=0.4x^2+0.5x equation:


Simplifying
60 = 0.4x2 + 0.5x

Reorder the terms:
60 = 0.5x + 0.4x2

Solving
60 = 0.5x + 0.4x2

Solving for variable 'x'.

Reorder the terms:
60 + -0.5x + -0.4x2 = 0.5x + -0.5x + 0.4x2 + -0.4x2

Combine like terms: 0.5x + -0.5x = 0.0
60 + -0.5x + -0.4x2 = 0.0 + 0.4x2 + -0.4x2
60 + -0.5x + -0.4x2 = 0.4x2 + -0.4x2

Combine like terms: 0.4x2 + -0.4x2 = 0.0
60 + -0.5x + -0.4x2 = 0.0

Begin completing the square.  Divide all terms by
-0.4 the coefficient of the squared term: 

Divide each side by '-0.4'.
-150 + 1.25x + x2 = 0

Move the constant term to the right:

Add '150' to each side of the equation.
-150 + 1.25x + 150 + x2 = 0 + 150

Reorder the terms:
-150 + 150 + 1.25x + x2 = 0 + 150

Combine like terms: -150 + 150 = 0
0 + 1.25x + x2 = 0 + 150
1.25x + x2 = 0 + 150

Combine like terms: 0 + 150 = 150
1.25x + x2 = 150

The x term is 1.25x.  Take half its coefficient (0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
1.25x + 0.390625 + x2 = 150 + 0.390625

Reorder the terms:
0.390625 + 1.25x + x2 = 150 + 0.390625

Combine like terms: 150 + 0.390625 = 150.390625
0.390625 + 1.25x + x2 = 150.390625

Factor a perfect square on the left side:
(x + 0.625)(x + 0.625) = 150.390625

Calculate the square root of the right side: 12.263385544

Break this problem into two subproblems by setting 
(x + 0.625) equal to 12.263385544 and -12.263385544.

Subproblem 1

x + 0.625 = 12.263385544 Simplifying x + 0.625 = 12.263385544 Reorder the terms: 0.625 + x = 12.263385544 Solving 0.625 + x = 12.263385544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = 12.263385544 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = 12.263385544 + -0.625 x = 12.263385544 + -0.625 Combine like terms: 12.263385544 + -0.625 = 11.638385544 x = 11.638385544 Simplifying x = 11.638385544

Subproblem 2

x + 0.625 = -12.263385544 Simplifying x + 0.625 = -12.263385544 Reorder the terms: 0.625 + x = -12.263385544 Solving 0.625 + x = -12.263385544 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.625' to each side of the equation. 0.625 + -0.625 + x = -12.263385544 + -0.625 Combine like terms: 0.625 + -0.625 = 0.000 0.000 + x = -12.263385544 + -0.625 x = -12.263385544 + -0.625 Combine like terms: -12.263385544 + -0.625 = -12.888385544 x = -12.888385544 Simplifying x = -12.888385544

Solution

The solution to the problem is based on the solutions from the subproblems. x = {11.638385544, -12.888385544}

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