21x^2=35x-8

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Solution for 21x^2=35x-8 equation:


Simplifying
21x2 = 35x + -8

Reorder the terms:
21x2 = -8 + 35x

Solving
21x2 = -8 + 35x

Solving for variable 'x'.

Reorder the terms:
8 + -35x + 21x2 = -8 + 35x + 8 + -35x

Reorder the terms:
8 + -35x + 21x2 = -8 + 8 + 35x + -35x

Combine like terms: -8 + 8 = 0
8 + -35x + 21x2 = 0 + 35x + -35x
8 + -35x + 21x2 = 35x + -35x

Combine like terms: 35x + -35x = 0
8 + -35x + 21x2 = 0

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

Divide each side by '21'.
0.380952381 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '-0.380952381' to each side of the equation.
0.380952381 + -1.666666667x + -0.380952381 + x2 = 0 + -0.380952381

Reorder the terms:
0.380952381 + -0.380952381 + -1.666666667x + x2 = 0 + -0.380952381

Combine like terms: 0.380952381 + -0.380952381 = 0.000000000
0.000000000 + -1.666666667x + x2 = 0 + -0.380952381
-1.666666667x + x2 = 0 + -0.380952381

Combine like terms: 0 + -0.380952381 = -0.380952381
-1.666666667x + x2 = -0.380952381

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = -0.380952381 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = -0.380952381 + 0.6944444447

Combine like terms: -0.380952381 + 0.6944444447 = 0.3134920637
0.6944444447 + -1.666666667x + x2 = 0.3134920637

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 0.3134920637

Calculate the square root of the right side: 0.55990362

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 0.55990362 and -0.55990362.

Subproblem 1

x + -0.8333333335 = 0.55990362 Simplifying x + -0.8333333335 = 0.55990362 Reorder the terms: -0.8333333335 + x = 0.55990362 Solving -0.8333333335 + x = 0.55990362 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = 0.55990362 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = 0.55990362 + 0.8333333335 x = 0.55990362 + 0.8333333335 Combine like terms: 0.55990362 + 0.8333333335 = 1.3932369535 x = 1.3932369535 Simplifying x = 1.3932369535

Subproblem 2

x + -0.8333333335 = -0.55990362 Simplifying x + -0.8333333335 = -0.55990362 Reorder the terms: -0.8333333335 + x = -0.55990362 Solving -0.8333333335 + x = -0.55990362 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.8333333335' to each side of the equation. -0.8333333335 + 0.8333333335 + x = -0.55990362 + 0.8333333335 Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000 0.0000000000 + x = -0.55990362 + 0.8333333335 x = -0.55990362 + 0.8333333335 Combine like terms: -0.55990362 + 0.8333333335 = 0.2734297135 x = 0.2734297135 Simplifying x = 0.2734297135

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.3932369535, 0.2734297135}

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