12x+2.5x^2=162

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Solution for 12x+2.5x^2=162 equation:


Simplifying
12x + 2.5x2 = 162

Solving
12x + 2.5x2 = 162

Solving for variable 'x'.

Reorder the terms:
-162 + 12x + 2.5x2 = 162 + -162

Combine like terms: 162 + -162 = 0
-162 + 12x + 2.5x2 = 0

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

Divide each side by '2.5'.
-64.8 + 4.8x + x2 = 0

Move the constant term to the right:

Add '64.8' to each side of the equation.
-64.8 + 4.8x + 64.8 + x2 = 0 + 64.8

Reorder the terms:
-64.8 + 64.8 + 4.8x + x2 = 0 + 64.8

Combine like terms: -64.8 + 64.8 = 0.0
0.0 + 4.8x + x2 = 0 + 64.8
4.8x + x2 = 0 + 64.8

Combine like terms: 0 + 64.8 = 64.8
4.8x + x2 = 64.8

The x term is 4.8x.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8x + 5.76 + x2 = 64.8 + 5.76

Reorder the terms:
5.76 + 4.8x + x2 = 64.8 + 5.76

Combine like terms: 64.8 + 5.76 = 70.56
5.76 + 4.8x + x2 = 70.56

Factor a perfect square on the left side:
(x + 2.4)(x + 2.4) = 70.56

Calculate the square root of the right side: 8.4

Break this problem into two subproblems by setting 
(x + 2.4) equal to 8.4 and -8.4.

Subproblem 1

x + 2.4 = 8.4 Simplifying x + 2.4 = 8.4 Reorder the terms: 2.4 + x = 8.4 Solving 2.4 + x = 8.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = 8.4 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = 8.4 + -2.4 x = 8.4 + -2.4 Combine like terms: 8.4 + -2.4 = 6 x = 6 Simplifying x = 6

Subproblem 2

x + 2.4 = -8.4 Simplifying x + 2.4 = -8.4 Reorder the terms: 2.4 + x = -8.4 Solving 2.4 + x = -8.4 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = -8.4 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = -8.4 + -2.4 x = -8.4 + -2.4 Combine like terms: -8.4 + -2.4 = -10.8 x = -10.8 Simplifying x = -10.8

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6, -10.8}

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