5x^2=x+300

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Solution for 5x^2=x+300 equation:


Simplifying
5x2 = x + 300

Reorder the terms:
5x2 = 300 + x

Solving
5x2 = 300 + x

Solving for variable 'x'.

Reorder the terms:
-300 + -1x + 5x2 = 300 + x + -300 + -1x

Reorder the terms:
-300 + -1x + 5x2 = 300 + -300 + x + -1x

Combine like terms: 300 + -300 = 0
-300 + -1x + 5x2 = 0 + x + -1x
-300 + -1x + 5x2 = x + -1x

Combine like terms: x + -1x = 0
-300 + -1x + 5x2 = 0

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

Divide each side by '5'.
-60 + -0.2x + x2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -0.2x + 60 + x2 = 0 + 60

Reorder the terms:
-60 + 60 + -0.2x + x2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -0.2x + x2 = 0 + 60
-0.2x + x2 = 0 + 60

Combine like terms: 0 + 60 = 60
-0.2x + x2 = 60

The x term is -0.2x.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2x + 0.01 + x2 = 60 + 0.01

Reorder the terms:
0.01 + -0.2x + x2 = 60 + 0.01

Combine like terms: 60 + 0.01 = 60.01
0.01 + -0.2x + x2 = 60.01

Factor a perfect square on the left side:
(x + -0.1)(x + -0.1) = 60.01

Calculate the square root of the right side: 7.746612163

Break this problem into two subproblems by setting 
(x + -0.1) equal to 7.746612163 and -7.746612163.

Subproblem 1

x + -0.1 = 7.746612163 Simplifying x + -0.1 = 7.746612163 Reorder the terms: -0.1 + x = 7.746612163 Solving -0.1 + x = 7.746612163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = 7.746612163 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = 7.746612163 + 0.1 x = 7.746612163 + 0.1 Combine like terms: 7.746612163 + 0.1 = 7.846612163 x = 7.846612163 Simplifying x = 7.846612163

Subproblem 2

x + -0.1 = -7.746612163 Simplifying x + -0.1 = -7.746612163 Reorder the terms: -0.1 + x = -7.746612163 Solving -0.1 + x = -7.746612163 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + x = -7.746612163 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + x = -7.746612163 + 0.1 x = -7.746612163 + 0.1 Combine like terms: -7.746612163 + 0.1 = -7.646612163 x = -7.646612163 Simplifying x = -7.646612163

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.846612163, -7.646612163}

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