(X+1)(X+2)=40

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Solution for (X+1)(X+2)=40 equation:


Simplifying
(X + 1)(X + 2) = 40

Reorder the terms:
(1 + X)(X + 2) = 40

Reorder the terms:
(1 + X)(2 + X) = 40

Multiply (1 + X) * (2 + X)
(1(2 + X) + X(2 + X)) = 40
((2 * 1 + X * 1) + X(2 + X)) = 40
((2 + 1X) + X(2 + X)) = 40
(2 + 1X + (2 * X + X * X)) = 40
(2 + 1X + (2X + X2)) = 40

Combine like terms: 1X + 2X = 3X
(2 + 3X + X2) = 40

Solving
2 + 3X + X2 = 40

Solving for variable 'X'.

Reorder the terms:
2 + -40 + 3X + X2 = 40 + -40

Combine like terms: 2 + -40 = -38
-38 + 3X + X2 = 40 + -40

Combine like terms: 40 + -40 = 0
-38 + 3X + X2 = 0

Begin completing the square.

Move the constant term to the right:

Add '38' to each side of the equation.
-38 + 3X + 38 + X2 = 0 + 38

Reorder the terms:
-38 + 38 + 3X + X2 = 0 + 38

Combine like terms: -38 + 38 = 0
0 + 3X + X2 = 0 + 38
3X + X2 = 0 + 38

Combine like terms: 0 + 38 = 38
3X + X2 = 38

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 = 38 + 2.25

Reorder the terms:
2.25 + 3X + X2 = 38 + 2.25

Combine like terms: 38 + 2.25 = 40.25
2.25 + 3X + X2 = 40.25

Factor a perfect square on the left side:
(X + 1.5)(X + 1.5) = 40.25

Calculate the square root of the right side: 6.34428877

Break this problem into two subproblems by setting 
(X + 1.5) equal to 6.34428877 and -6.34428877.

Subproblem 1

X + 1.5 = 6.34428877 Simplifying X + 1.5 = 6.34428877 Reorder the terms: 1.5 + X = 6.34428877 Solving 1.5 + X = 6.34428877 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 = 6.34428877 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + X = 6.34428877 + -1.5 X = 6.34428877 + -1.5 Combine like terms: 6.34428877 + -1.5 = 4.84428877 X = 4.84428877 Simplifying X = 4.84428877

Subproblem 2

X + 1.5 = -6.34428877 Simplifying X + 1.5 = -6.34428877 Reorder the terms: 1.5 + X = -6.34428877 Solving 1.5 + X = -6.34428877 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 = -6.34428877 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + X = -6.34428877 + -1.5 X = -6.34428877 + -1.5 Combine like terms: -6.34428877 + -1.5 = -7.84428877 X = -7.84428877 Simplifying X = -7.84428877

Solution

The solution to the problem is based on the solutions from the subproblems. X = {4.84428877, -7.84428877}

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