1.5z^2+5z-4.5=0

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Solution for 1.5z^2+5z-4.5=0 equation:


Simplifying
1.5z2 + 5z + -4.5 = 0

Reorder the terms:
-4.5 + 5z + 1.5z2 = 0

Solving
-4.5 + 5z + 1.5z2 = 0

Solving for variable 'z'.

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

Divide each side by '1.5'.
-3 + 3.333333333z + z2 = 0

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 3.333333333z + 3 + z2 = 0 + 3

Reorder the terms:
-3 + 3 + 3.333333333z + z2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 3.333333333z + z2 = 0 + 3
3.333333333z + z2 = 0 + 3

Combine like terms: 0 + 3 = 3
3.333333333z + z2 = 3

The z term is 3.333333333z.  Take half its coefficient (1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
3.333333333z + 2.777777779 + z2 = 3 + 2.777777779

Reorder the terms:
2.777777779 + 3.333333333z + z2 = 3 + 2.777777779

Combine like terms: 3 + 2.777777779 = 5.777777779
2.777777779 + 3.333333333z + z2 = 5.777777779

Factor a perfect square on the left side:
(z + 1.666666667)(z + 1.666666667) = 5.777777779

Calculate the square root of the right side: 2.403700851

Break this problem into two subproblems by setting 
(z + 1.666666667) equal to 2.403700851 and -2.403700851.

Subproblem 1

z + 1.666666667 = 2.403700851 Simplifying z + 1.666666667 = 2.403700851 Reorder the terms: 1.666666667 + z = 2.403700851 Solving 1.666666667 + z = 2.403700851 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + z = 2.403700851 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + z = 2.403700851 + -1.666666667 z = 2.403700851 + -1.666666667 Combine like terms: 2.403700851 + -1.666666667 = 0.737034184 z = 0.737034184 Simplifying z = 0.737034184

Subproblem 2

z + 1.666666667 = -2.403700851 Simplifying z + 1.666666667 = -2.403700851 Reorder the terms: 1.666666667 + z = -2.403700851 Solving 1.666666667 + z = -2.403700851 Solving for variable 'z'. Move all terms containing z to the left, all other terms to the right. Add '-1.666666667' to each side of the equation. 1.666666667 + -1.666666667 + z = -2.403700851 + -1.666666667 Combine like terms: 1.666666667 + -1.666666667 = 0.000000000 0.000000000 + z = -2.403700851 + -1.666666667 z = -2.403700851 + -1.666666667 Combine like terms: -2.403700851 + -1.666666667 = -4.070367518 z = -4.070367518 Simplifying z = -4.070367518

Solution

The solution to the problem is based on the solutions from the subproblems. z = {0.737034184, -4.070367518}

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