3x^2+22x+40=100

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Solution for 3x^2+22x+40=100 equation:


Simplifying
3x2 + 22x + 40 = 100

Reorder the terms:
40 + 22x + 3x2 = 100

Solving
40 + 22x + 3x2 = 100

Solving for variable 'x'.

Reorder the terms:
40 + -100 + 22x + 3x2 = 100 + -100

Combine like terms: 40 + -100 = -60
-60 + 22x + 3x2 = 100 + -100

Combine like terms: 100 + -100 = 0
-60 + 22x + 3x2 = 0

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

Divide each side by '3'.
-20 + 7.333333333x + x2 = 0

Move the constant term to the right:

Add '20' to each side of the equation.
-20 + 7.333333333x + 20 + x2 = 0 + 20

Reorder the terms:
-20 + 20 + 7.333333333x + x2 = 0 + 20

Combine like terms: -20 + 20 = 0
0 + 7.333333333x + x2 = 0 + 20
7.333333333x + x2 = 0 + 20

Combine like terms: 0 + 20 = 20
7.333333333x + x2 = 20

The x term is 7.333333333x.  Take half its coefficient (3.666666667).
Square it (13.44444445) and add it to both sides.

Add '13.44444445' to each side of the equation.
7.333333333x + 13.44444445 + x2 = 20 + 13.44444445

Reorder the terms:
13.44444445 + 7.333333333x + x2 = 20 + 13.44444445

Combine like terms: 20 + 13.44444445 = 33.44444445
13.44444445 + 7.333333333x + x2 = 33.44444445

Factor a perfect square on the left side:
(x + 3.666666667)(x + 3.666666667) = 33.44444445

Calculate the square root of the right side: 5.783117191

Break this problem into two subproblems by setting 
(x + 3.666666667) equal to 5.783117191 and -5.783117191.

Subproblem 1

x + 3.666666667 = 5.783117191 Simplifying x + 3.666666667 = 5.783117191 Reorder the terms: 3.666666667 + x = 5.783117191 Solving 3.666666667 + x = 5.783117191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.666666667' to each side of the equation. 3.666666667 + -3.666666667 + x = 5.783117191 + -3.666666667 Combine like terms: 3.666666667 + -3.666666667 = 0.000000000 0.000000000 + x = 5.783117191 + -3.666666667 x = 5.783117191 + -3.666666667 Combine like terms: 5.783117191 + -3.666666667 = 2.116450524 x = 2.116450524 Simplifying x = 2.116450524

Subproblem 2

x + 3.666666667 = -5.783117191 Simplifying x + 3.666666667 = -5.783117191 Reorder the terms: 3.666666667 + x = -5.783117191 Solving 3.666666667 + x = -5.783117191 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3.666666667' to each side of the equation. 3.666666667 + -3.666666667 + x = -5.783117191 + -3.666666667 Combine like terms: 3.666666667 + -3.666666667 = 0.000000000 0.000000000 + x = -5.783117191 + -3.666666667 x = -5.783117191 + -3.666666667 Combine like terms: -5.783117191 + -3.666666667 = -9.449783858 x = -9.449783858 Simplifying x = -9.449783858

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.116450524, -9.449783858}

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