x*x+3x=510

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Solution for x*x+3x=510 equation:


Simplifying
x * x + 3x = 510

Multiply x * x
x2 + 3x = 510

Reorder the terms:
3x + x2 = 510

Solving
3x + x2 = 510

Solving for variable 'x'.

Reorder the terms:
-510 + 3x + x2 = 510 + -510

Combine like terms: 510 + -510 = 0
-510 + 3x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '510' to each side of the equation.
-510 + 3x + 510 + x2 = 0 + 510

Reorder the terms:
-510 + 510 + 3x + x2 = 0 + 510

Combine like terms: -510 + 510 = 0
0 + 3x + x2 = 0 + 510
3x + x2 = 0 + 510

Combine like terms: 0 + 510 = 510
3x + x2 = 510

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 = 510 + 2.25

Reorder the terms:
2.25 + 3x + x2 = 510 + 2.25

Combine like terms: 510 + 2.25 = 512.25
2.25 + 3x + x2 = 512.25

Factor a perfect square on the left side:
(x + 1.5)(x + 1.5) = 512.25

Calculate the square root of the right side: 22.632940596

Break this problem into two subproblems by setting 
(x + 1.5) equal to 22.632940596 and -22.632940596.

Subproblem 1

x + 1.5 = 22.632940596 Simplifying x + 1.5 = 22.632940596 Reorder the terms: 1.5 + x = 22.632940596 Solving 1.5 + x = 22.632940596 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 = 22.632940596 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = 22.632940596 + -1.5 x = 22.632940596 + -1.5 Combine like terms: 22.632940596 + -1.5 = 21.132940596 x = 21.132940596 Simplifying x = 21.132940596

Subproblem 2

x + 1.5 = -22.632940596 Simplifying x + 1.5 = -22.632940596 Reorder the terms: 1.5 + x = -22.632940596 Solving 1.5 + x = -22.632940596 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 = -22.632940596 + -1.5 Combine like terms: 1.5 + -1.5 = 0.0 0.0 + x = -22.632940596 + -1.5 x = -22.632940596 + -1.5 Combine like terms: -22.632940596 + -1.5 = -24.132940596 x = -24.132940596 Simplifying x = -24.132940596

Solution

The solution to the problem is based on the solutions from the subproblems. x = {21.132940596, -24.132940596}

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