15x^2+22x=8

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Solution for 15x^2+22x=8 equation:


Simplifying
15x2 + 22x = 8

Reorder the terms:
22x + 15x2 = 8

Solving
22x + 15x2 = 8

Solving for variable 'x'.

Reorder the terms:
-8 + 22x + 15x2 = 8 + -8

Combine like terms: 8 + -8 = 0
-8 + 22x + 15x2 = 0

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

Divide each side by '15'.
-0.5333333333 + 1.466666667x + x2 = 0

Move the constant term to the right:

Add '0.5333333333' to each side of the equation.
-0.5333333333 + 1.466666667x + 0.5333333333 + x2 = 0 + 0.5333333333

Reorder the terms:
-0.5333333333 + 0.5333333333 + 1.466666667x + x2 = 0 + 0.5333333333

Combine like terms: -0.5333333333 + 0.5333333333 = 0.0000000000
0.0000000000 + 1.466666667x + x2 = 0 + 0.5333333333
1.466666667x + x2 = 0 + 0.5333333333

Combine like terms: 0 + 0.5333333333 = 0.5333333333
1.466666667x + x2 = 0.5333333333

The x term is 1.466666667x.  Take half its coefficient (0.7333333335).
Square it (0.5377777780) and add it to both sides.

Add '0.5377777780' to each side of the equation.
1.466666667x + 0.5377777780 + x2 = 0.5333333333 + 0.5377777780

Reorder the terms:
0.5377777780 + 1.466666667x + x2 = 0.5333333333 + 0.5377777780

Combine like terms: 0.5333333333 + 0.5377777780 = 1.0711111113
0.5377777780 + 1.466666667x + x2 = 1.0711111113

Factor a perfect square on the left side:
(x + 0.7333333335)(x + 0.7333333335) = 1.0711111113

Calculate the square root of the right side: 1.03494498

Break this problem into two subproblems by setting 
(x + 0.7333333335) equal to 1.03494498 and -1.03494498.

Subproblem 1

x + 0.7333333335 = 1.03494498 Simplifying x + 0.7333333335 = 1.03494498 Reorder the terms: 0.7333333335 + x = 1.03494498 Solving 0.7333333335 + x = 1.03494498 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7333333335' to each side of the equation. 0.7333333335 + -0.7333333335 + x = 1.03494498 + -0.7333333335 Combine like terms: 0.7333333335 + -0.7333333335 = 0.0000000000 0.0000000000 + x = 1.03494498 + -0.7333333335 x = 1.03494498 + -0.7333333335 Combine like terms: 1.03494498 + -0.7333333335 = 0.3016116465 x = 0.3016116465 Simplifying x = 0.3016116465

Subproblem 2

x + 0.7333333335 = -1.03494498 Simplifying x + 0.7333333335 = -1.03494498 Reorder the terms: 0.7333333335 + x = -1.03494498 Solving 0.7333333335 + x = -1.03494498 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.7333333335' to each side of the equation. 0.7333333335 + -0.7333333335 + x = -1.03494498 + -0.7333333335 Combine like terms: 0.7333333335 + -0.7333333335 = 0.0000000000 0.0000000000 + x = -1.03494498 + -0.7333333335 x = -1.03494498 + -0.7333333335 Combine like terms: -1.03494498 + -0.7333333335 = -1.7682783135 x = -1.7682783135 Simplifying x = -1.7682783135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.3016116465, -1.7682783135}

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