x^2+3x-718=0

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Solution for x^2+3x-718=0 equation:


Simplifying
x2 + 3x + -718 = 0

Reorder the terms:
-718 + 3x + x2 = 0

Solving
-718 + 3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '718' to each side of the equation.
-718 + 3x + 718 + x2 = 0 + 718

Reorder the terms:
-718 + 718 + 3x + x2 = 0 + 718

Combine like terms: -718 + 718 = 0
0 + 3x + x2 = 0 + 718
3x + x2 = 0 + 718

Combine like terms: 0 + 718 = 718
3x + x2 = 718

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 = 718 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 718 + 2.25

Combine like terms: 718 + 2.25 = 720.25
2.25 + 3x + x2 = 720.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 720.25

Calculate the square root of the right side: 26.837473801

Break this problem into two subproblems by setting 
(x + 1.5) equal to 26.837473801 and -26.837473801.

Subproblem 1

x + 1.5 = 26.837473801 Simplifying x + 1.5 = 26.837473801 Reorder the terms: 1.5 + x = 26.837473801 Solving 1.5 + x = 26.837473801 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 = 26.837473801 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 26.837473801 + -1.5 x = 26.837473801 + -1.5 Combine like terms: 26.837473801 + -1.5 = 25.337473801 x = 25.337473801 Simplifying x = 25.337473801

Subproblem 2

x + 1.5 = -26.837473801 Simplifying x + 1.5 = -26.837473801 Reorder the terms: 1.5 + x = -26.837473801 Solving 1.5 + x = -26.837473801 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 = -26.837473801 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -26.837473801 + -1.5 x = -26.837473801 + -1.5 Combine like terms: -26.837473801 + -1.5 = -28.337473801 x = -28.337473801 Simplifying x = -28.337473801

Solution

The solution to the problem is based on the solutions from the subproblems. x = {25.337473801, -28.337473801}

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