3x^2-7x-40=10

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Solution for 3x^2-7x-40=10 equation: 


Simplifying
3x2 + -7x + -40 = 10

Reorder the terms:
-40 + -7x + 3x2 = 10

Solving
-40 + -7x + 3x2 = 10

Solving for variable 'x'.

Reorder the terms:
-40 + -10 + -7x + 3x2 = 10 + -10

Combine like terms: -40 + -10 = -50
-50 + -7x + 3x2 = 10 + -10

Combine like terms: 10 + -10 = 0
-50 + -7x + 3x2 = 0

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

Divide each side by '3'.
-16.66666667 + -2.333333333x + x2 = 0

Move the constant term to the right:

Add '16.66666667' to each side of the equation.
-16.66666667 + -2.333333333x + 16.66666667 + x2 = 0 + 16.66666667

Reorder the terms:
-16.66666667 + 16.66666667 + -2.333333333x + x2 = 0 + 16.66666667

Combine like terms: -16.66666667 + 16.66666667 = 0.00000000
0.00000000 + -2.333333333x + x2 = 0 + 16.66666667
-2.333333333x + x2 = 0 + 16.66666667

Combine like terms: 0 + 16.66666667 = 16.66666667
-2.333333333x + x2 = 16.66666667

The x term is -2.333333333x.  Take half its coefficient (-1.166666667).
Square it (1.361111112) and add it to both sides.

Add '1.361111112' to each side of the equation.
-2.333333333x + 1.361111112 + x2 = 16.66666667 + 1.361111112

Reorder the terms:
1.361111112 + -2.333333333x + x2 = 16.66666667 + 1.361111112

Combine like terms: 16.66666667 + 1.361111112 = 18.027777782
1.361111112 + -2.333333333x + x2 = 18.027777782

Factor a perfect square on the left side:
(x + -1.166666667)(x + -1.166666667) = 18.027777782

Calculate the square root of the right side: 4.245913068

Break this problem into two subproblems by setting 
(x + -1.166666667) equal to 4.245913068 and -4.245913068.


Subproblem 1
x + -1.166666667 = 4.245913068

Simplifying
x + -1.166666667 = 4.245913068

Reorder the terms:
-1.166666667 + x = 4.245913068

Solving
-1.166666667 + x = 4.245913068

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.166666667' to each side of the equation.
-1.166666667 + 1.166666667 + x = 4.245913068 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + x = 4.245913068 + 1.166666667
x = 4.245913068 + 1.166666667

Combine like terms: 4.245913068 + 1.166666667 = 5.412579735
x = 5.412579735

Simplifying
x = 5.412579735


Subproblem 2
x + -1.166666667 = -4.245913068

Simplifying
x + -1.166666667 = -4.245913068

Reorder the terms:
-1.166666667 + x = -4.245913068

Solving
-1.166666667 + x = -4.245913068

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '1.166666667' to each side of the equation.
-1.166666667 + 1.166666667 + x = -4.245913068 + 1.166666667

Combine like terms: -1.166666667 + 1.166666667 = 0.000000000
0.000000000 + x = -4.245913068 + 1.166666667
x = -4.245913068 + 1.166666667

Combine like terms: -4.245913068 + 1.166666667 = -3.079246401
x = -3.079246401

Simplifying
x = -3.079246401


Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {5.412579735, -3.079246401}

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