-.5x^2+1.5x+40=5

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Solution for -.5x^2+1.5x+40=5 equation:


Simplifying
-0.5x2 + 1.5x + 40 = 5

Reorder the terms:
40 + 1.5x + -0.5x2 = 5

Solving
40 + 1.5x + -0.5x2 = 5

Solving for variable 'x'.

Reorder the terms:
40 + -5 + 1.5x + -0.5x2 = 5 + -5

Combine like terms: 40 + -5 = 35
35 + 1.5x + -0.5x2 = 5 + -5

Combine like terms: 5 + -5 = 0
35 + 1.5x + -0.5x2 = 0

Begin completing the square.  Divide all terms by
-0.5 the coefficient of the squared term: 

Divide each side by '-0.5'.
-70 + -3x + x2 = 0

Move the constant term to the right:

Add '70' to each side of the equation.
-70 + -3x + 70 + x2 = 0 + 70

Reorder the terms:
-70 + 70 + -3x + x2 = 0 + 70

Combine like terms: -70 + 70 = 0
0 + -3x + x2 = 0 + 70
-3x + x2 = 0 + 70

Combine like terms: 0 + 70 = 70
-3x + x2 = 70

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 70 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 70 + 2.25

Combine like terms: 70 + 2.25 = 72.25
2.25 + -3x + x2 = 72.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 72.25

Calculate the square root of the right side: 8.5

Break this problem into two subproblems by setting 
(x + -1.5) equal to 8.5 and -8.5.

Subproblem 1

x + -1.5 = 8.5 Simplifying x + -1.5 = 8.5 Reorder the terms: -1.5 + x = 8.5 Solving -1.5 + x = 8.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 8.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 8.5 + 1.5 x = 8.5 + 1.5 Combine like terms: 8.5 + 1.5 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + -1.5 = -8.5 Simplifying x + -1.5 = -8.5 Reorder the terms: -1.5 + x = -8.5 Solving -1.5 + x = -8.5 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -8.5 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -8.5 + 1.5 x = -8.5 + 1.5 Combine like terms: -8.5 + 1.5 = -7 x = -7 Simplifying x = -7

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -7}

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