-21=3y^2-14y

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Solution for -21=3y^2-14y equation:


Simplifying
-21 = 3y2 + -14y

Reorder the terms:
-21 = -14y + 3y2

Solving
-21 = -14y + 3y2

Solving for variable 'y'.

Reorder the terms:
-21 + 14y + -3y2 = -14y + 14y + 3y2 + -3y2

Combine like terms: -14y + 14y = 0
-21 + 14y + -3y2 = 0 + 3y2 + -3y2
-21 + 14y + -3y2 = 3y2 + -3y2

Combine like terms: 3y2 + -3y2 = 0
-21 + 14y + -3y2 = 0

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

Divide each side by '-3'.
7 + -4.666666667y + y2 = 0

Move the constant term to the right:

Add '-7' to each side of the equation.
7 + -4.666666667y + -7 + y2 = 0 + -7

Reorder the terms:
7 + -7 + -4.666666667y + y2 = 0 + -7

Combine like terms: 7 + -7 = 0
0 + -4.666666667y + y2 = 0 + -7
-4.666666667y + y2 = 0 + -7

Combine like terms: 0 + -7 = -7
-4.666666667y + y2 = -7

The y term is -4.666666667y.  Take half its coefficient (-2.333333334).
Square it (5.444444448) and add it to both sides.

Add '5.444444448' to each side of the equation.
-4.666666667y + 5.444444448 + y2 = -7 + 5.444444448

Reorder the terms:
5.444444448 + -4.666666667y + y2 = -7 + 5.444444448

Combine like terms: -7 + 5.444444448 = -1.555555552
5.444444448 + -4.666666667y + y2 = -1.555555552

Factor a perfect square on the left side:
(y + -2.333333334)(y + -2.333333334) = -1.555555552

Can't calculate square root of the right side.

The solution to this equation could not be determined.

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