3x^2+8x=270

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Solution for 3x^2+8x=270 equation:


Simplifying
3x2 + 8x = 270

Reorder the terms:
8x + 3x2 = 270

Solving
8x + 3x2 = 270

Solving for variable 'x'.

Reorder the terms:
-270 + 8x + 3x2 = 270 + -270

Combine like terms: 270 + -270 = 0
-270 + 8x + 3x2 = 0

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

Divide each side by '3'.
-90 + 2.666666667x + x2 = 0

Move the constant term to the right:

Add '90' to each side of the equation.
-90 + 2.666666667x + 90 + x2 = 0 + 90

Reorder the terms:
-90 + 90 + 2.666666667x + x2 = 0 + 90

Combine like terms: -90 + 90 = 0
0 + 2.666666667x + x2 = 0 + 90
2.666666667x + x2 = 0 + 90

Combine like terms: 0 + 90 = 90
2.666666667x + x2 = 90

The x term is 2.666666667x.  Take half its coefficient (1.333333334).
Square it (1.777777780) and add it to both sides.

Add '1.777777780' to each side of the equation.
2.666666667x + 1.777777780 + x2 = 90 + 1.777777780

Reorder the terms:
1.777777780 + 2.666666667x + x2 = 90 + 1.777777780

Combine like terms: 90 + 1.777777780 = 91.77777778
1.777777780 + 2.666666667x + x2 = 91.77777778

Factor a perfect square on the left side:
(x + 1.333333334)(x + 1.333333334) = 91.77777778

Calculate the square root of the right side: 9.580071909

Break this problem into two subproblems by setting 
(x + 1.333333334) equal to 9.580071909 and -9.580071909.

Subproblem 1

x + 1.333333334 = 9.580071909 Simplifying x + 1.333333334 = 9.580071909 Reorder the terms: 1.333333334 + x = 9.580071909 Solving 1.333333334 + x = 9.580071909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = 9.580071909 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = 9.580071909 + -1.333333334 x = 9.580071909 + -1.333333334 Combine like terms: 9.580071909 + -1.333333334 = 8.246738575 x = 8.246738575 Simplifying x = 8.246738575

Subproblem 2

x + 1.333333334 = -9.580071909 Simplifying x + 1.333333334 = -9.580071909 Reorder the terms: 1.333333334 + x = -9.580071909 Solving 1.333333334 + x = -9.580071909 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.333333334' to each side of the equation. 1.333333334 + -1.333333334 + x = -9.580071909 + -1.333333334 Combine like terms: 1.333333334 + -1.333333334 = 0.000000000 0.000000000 + x = -9.580071909 + -1.333333334 x = -9.580071909 + -1.333333334 Combine like terms: -9.580071909 + -1.333333334 = -10.913405243 x = -10.913405243 Simplifying x = -10.913405243

Solution

The solution to the problem is based on the solutions from the subproblems. x = {8.246738575, -10.913405243}

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