4y^2-100y+7=0

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Solution for 4y^2-100y+7=0 equation:


Simplifying
4y2 + -100y + 7 = 0

Reorder the terms:
7 + -100y + 4y2 = 0

Solving
7 + -100y + 4y2 = 0

Solving for variable 'y'.

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

Divide each side by '4'.
1.75 + -25y + y2 = 0

Move the constant term to the right:

Add '-1.75' to each side of the equation.
1.75 + -25y + -1.75 + y2 = 0 + -1.75

Reorder the terms:
1.75 + -1.75 + -25y + y2 = 0 + -1.75

Combine like terms: 1.75 + -1.75 = 0.00
0.00 + -25y + y2 = 0 + -1.75
-25y + y2 = 0 + -1.75

Combine like terms: 0 + -1.75 = -1.75
-25y + y2 = -1.75

The y term is -25y.  Take half its coefficient (-12.5).
Square it (156.25) and add it to both sides.

Add '156.25' to each side of the equation.
-25y + 156.25 + y2 = -1.75 + 156.25

Reorder the terms:
156.25 + -25y + y2 = -1.75 + 156.25

Combine like terms: -1.75 + 156.25 = 154.5
156.25 + -25y + y2 = 154.5

Factor a perfect square on the left side:
(y + -12.5)(y + -12.5) = 154.5

Calculate the square root of the right side: 12.429802895

Break this problem into two subproblems by setting 
(y + -12.5) equal to 12.429802895 and -12.429802895.

Subproblem 1

y + -12.5 = 12.429802895 Simplifying y + -12.5 = 12.429802895 Reorder the terms: -12.5 + y = 12.429802895 Solving -12.5 + y = 12.429802895 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + y = 12.429802895 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + y = 12.429802895 + 12.5 y = 12.429802895 + 12.5 Combine like terms: 12.429802895 + 12.5 = 24.929802895 y = 24.929802895 Simplifying y = 24.929802895

Subproblem 2

y + -12.5 = -12.429802895 Simplifying y + -12.5 = -12.429802895 Reorder the terms: -12.5 + y = -12.429802895 Solving -12.5 + y = -12.429802895 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '12.5' to each side of the equation. -12.5 + 12.5 + y = -12.429802895 + 12.5 Combine like terms: -12.5 + 12.5 = 0.0 0.0 + y = -12.429802895 + 12.5 y = -12.429802895 + 12.5 Combine like terms: -12.429802895 + 12.5 = 0.070197105 y = 0.070197105 Simplifying y = 0.070197105

Solution

The solution to the problem is based on the solutions from the subproblems. y = {24.929802895, 0.070197105}

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