3x^2+11x-75=0

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Solution for 3x^2+11x-75=0 equation:


Simplifying
3x2 + 11x + -75 = 0

Reorder the terms:
-75 + 11x + 3x2 = 0

Solving
-75 + 11x + 3x2 = 0

Solving for variable 'x'.

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

Divide each side by '3'.
-25 + 3.666666667x + x2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 3.666666667x + 25 + x2 = 0 + 25

Reorder the terms:
-25 + 25 + 3.666666667x + x2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 3.666666667x + x2 = 0 + 25
3.666666667x + x2 = 0 + 25

Combine like terms: 0 + 25 = 25
3.666666667x + x2 = 25

The x term is 3.666666667x.  Take half its coefficient (1.833333334).
Square it (3.361111114) and add it to both sides.

Add '3.361111114' to each side of the equation.
3.666666667x + 3.361111114 + x2 = 25 + 3.361111114

Reorder the terms:
3.361111114 + 3.666666667x + x2 = 25 + 3.361111114

Combine like terms: 25 + 3.361111114 = 28.361111114
3.361111114 + 3.666666667x + x2 = 28.361111114

Factor a perfect square on the left side:
(x + 1.833333334)(x + 1.833333334) = 28.361111114

Calculate the square root of the right side: 5.325515103

Break this problem into two subproblems by setting 
(x + 1.833333334) equal to 5.325515103 and -5.325515103.

Subproblem 1

x + 1.833333334 = 5.325515103 Simplifying x + 1.833333334 = 5.325515103 Reorder the terms: 1.833333334 + x = 5.325515103 Solving 1.833333334 + x = 5.325515103 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = 5.325515103 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = 5.325515103 + -1.833333334 x = 5.325515103 + -1.833333334 Combine like terms: 5.325515103 + -1.833333334 = 3.492181769 x = 3.492181769 Simplifying x = 3.492181769

Subproblem 2

x + 1.833333334 = -5.325515103 Simplifying x + 1.833333334 = -5.325515103 Reorder the terms: 1.833333334 + x = -5.325515103 Solving 1.833333334 + x = -5.325515103 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.833333334' to each side of the equation. 1.833333334 + -1.833333334 + x = -5.325515103 + -1.833333334 Combine like terms: 1.833333334 + -1.833333334 = 0.000000000 0.000000000 + x = -5.325515103 + -1.833333334 x = -5.325515103 + -1.833333334 Combine like terms: -5.325515103 + -1.833333334 = -7.158848437 x = -7.158848437 Simplifying x = -7.158848437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.492181769, -7.158848437}

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