x^2+3x-54=11

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Solution for x^2+3x-54=11 equation:


Simplifying
x2 + 3x + -54 = 11

Reorder the terms:
-54 + 3x + x2 = 11

Solving
-54 + 3x + x2 = 11

Solving for variable 'x'.

Reorder the terms:
-54 + -11 + 3x + x2 = 11 + -11

Combine like terms: -54 + -11 = -65
-65 + 3x + x2 = 11 + -11

Combine like terms: 11 + -11 = 0
-65 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '65' to each side of the equation.
-65 + 3x + 65 + x2 = 0 + 65

Reorder the terms:
-65 + 65 + 3x + x2 = 0 + 65

Combine like terms: -65 + 65 = 0
0 + 3x + x2 = 0 + 65
3x + x2 = 0 + 65

Combine like terms: 0 + 65 = 65
3x + x2 = 65

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 = 65 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 65 + 2.25

Combine like terms: 65 + 2.25 = 67.25
2.25 + 3x + x2 = 67.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 67.25

Calculate the square root of the right side: 8.200609733

Break this problem into two subproblems by setting 
(x + 1.5) equal to 8.200609733 and -8.200609733.

Subproblem 1

x + 1.5 = 8.200609733 Simplifying x + 1.5 = 8.200609733 Reorder the terms: 1.5 + x = 8.200609733 Solving 1.5 + x = 8.200609733 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 = 8.200609733 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 8.200609733 + -1.5 x = 8.200609733 + -1.5 Combine like terms: 8.200609733 + -1.5 = 6.700609733 x = 6.700609733 Simplifying x = 6.700609733

Subproblem 2

x + 1.5 = -8.200609733 Simplifying x + 1.5 = -8.200609733 Reorder the terms: 1.5 + x = -8.200609733 Solving 1.5 + x = -8.200609733 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 = -8.200609733 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -8.200609733 + -1.5 x = -8.200609733 + -1.5 Combine like terms: -8.200609733 + -1.5 = -9.700609733 x = -9.700609733 Simplifying x = -9.700609733

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.700609733, -9.700609733}

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