400=1.5x^2-3x+2.5

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Solution for 400=1.5x^2-3x+2.5 equation:


Simplifying
400 = 1.5x2 + -3x + 2.5

Reorder the terms:
400 = 2.5 + -3x + 1.5x2

Solving
400 = 2.5 + -3x + 1.5x2

Solving for variable 'x'.

Combine like terms: 400 + -2.5 = 397.5
397.5 + 3x + -1.5x2 = 2.5 + -3x + 1.5x2 + -2.5 + 3x + -1.5x2

Reorder the terms:
397.5 + 3x + -1.5x2 = 2.5 + -2.5 + -3x + 3x + 1.5x2 + -1.5x2

Combine like terms: 2.5 + -2.5 = 0.0
397.5 + 3x + -1.5x2 = 0.0 + -3x + 3x + 1.5x2 + -1.5x2
397.5 + 3x + -1.5x2 = -3x + 3x + 1.5x2 + -1.5x2

Combine like terms: -3x + 3x = 0
397.5 + 3x + -1.5x2 = 0 + 1.5x2 + -1.5x2
397.5 + 3x + -1.5x2 = 1.5x2 + -1.5x2

Combine like terms: 1.5x2 + -1.5x2 = 0.0
397.5 + 3x + -1.5x2 = 0.0

Begin completing the square.  Divide all terms by
-1.5 the coefficient of the squared term: 

Divide each side by '-1.5'.
-265 + -2x + x2 = 0

Move the constant term to the right:

Add '265' to each side of the equation.
-265 + -2x + 265 + x2 = 0 + 265

Reorder the terms:
-265 + 265 + -2x + x2 = 0 + 265

Combine like terms: -265 + 265 = 0
0 + -2x + x2 = 0 + 265
-2x + x2 = 0 + 265

Combine like terms: 0 + 265 = 265
-2x + x2 = 265

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 265 + 1

Reorder the terms:
1 + -2x + x2 = 265 + 1

Combine like terms: 265 + 1 = 266
1 + -2x + x2 = 266

Factor a perfect square on the left side:
(x + -1)(x + -1) = 266

Calculate the square root of the right side: 16.30950643

Break this problem into two subproblems by setting 
(x + -1) equal to 16.30950643 and -16.30950643.

Subproblem 1

x + -1 = 16.30950643 Simplifying x + -1 = 16.30950643 Reorder the terms: -1 + x = 16.30950643 Solving -1 + x = 16.30950643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 16.30950643 + 1 Combine like terms: -1 + 1 = 0 0 + x = 16.30950643 + 1 x = 16.30950643 + 1 Combine like terms: 16.30950643 + 1 = 17.30950643 x = 17.30950643 Simplifying x = 17.30950643

Subproblem 2

x + -1 = -16.30950643 Simplifying x + -1 = -16.30950643 Reorder the terms: -1 + x = -16.30950643 Solving -1 + x = -16.30950643 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -16.30950643 + 1 Combine like terms: -1 + 1 = 0 0 + x = -16.30950643 + 1 x = -16.30950643 + 1 Combine like terms: -16.30950643 + 1 = -15.30950643 x = -15.30950643 Simplifying x = -15.30950643

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.30950643, -15.30950643}

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