21y^2-15y+5=0

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Solution for 21y^2-15y+5=0 equation:


Simplifying
21y2 + -15y + 5 = 0

Reorder the terms:
5 + -15y + 21y2 = 0

Solving
5 + -15y + 21y2 = 0

Solving for variable 'y'.

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

Divide each side by '21'.
0.2380952381 + -0.7142857143y + y2 = 0

Move the constant term to the right:

Add '-0.2380952381' to each side of the equation.
0.2380952381 + -0.7142857143y + -0.2380952381 + y2 = 0 + -0.2380952381

Reorder the terms:
0.2380952381 + -0.2380952381 + -0.7142857143y + y2 = 0 + -0.2380952381

Combine like terms: 0.2380952381 + -0.2380952381 = 0.0000000000
0.0000000000 + -0.7142857143y + y2 = 0 + -0.2380952381
-0.7142857143y + y2 = 0 + -0.2380952381

Combine like terms: 0 + -0.2380952381 = -0.2380952381
-0.7142857143y + y2 = -0.2380952381

The y term is -0.7142857143y.  Take half its coefficient (-0.3571428572).
Square it (0.1275510204) and add it to both sides.

Add '0.1275510204' to each side of the equation.
-0.7142857143y + 0.1275510204 + y2 = -0.2380952381 + 0.1275510204

Reorder the terms:
0.1275510204 + -0.7142857143y + y2 = -0.2380952381 + 0.1275510204

Combine like terms: -0.2380952381 + 0.1275510204 = -0.1105442177
0.1275510204 + -0.7142857143y + y2 = -0.1105442177

Factor a perfect square on the left side:
(y + -0.3571428572)(y + -0.3571428572) = -0.1105442177

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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