100-4y^2-3y=0

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Solution for 100-4y^2-3y=0 equation:


Simplifying
100 + -4y2 + -3y = 0

Reorder the terms:
100 + -3y + -4y2 = 0

Solving
100 + -3y + -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'.
-25 + 0.75y + y2 = 0

Move the constant term to the right:

Add '25' to each side of the equation.
-25 + 0.75y + 25 + y2 = 0 + 25

Reorder the terms:
-25 + 25 + 0.75y + y2 = 0 + 25

Combine like terms: -25 + 25 = 0
0 + 0.75y + y2 = 0 + 25
0.75y + y2 = 0 + 25

Combine like terms: 0 + 25 = 25
0.75y + y2 = 25

The y term is 0.75y.  Take half its coefficient (0.375).
Square it (0.140625) and add it to both sides.

Add '0.140625' to each side of the equation.
0.75y + 0.140625 + y2 = 25 + 0.140625

Reorder the terms:
0.140625 + 0.75y + y2 = 25 + 0.140625

Combine like terms: 25 + 0.140625 = 25.140625
0.140625 + 0.75y + y2 = 25.140625

Factor a perfect square on the left side:
(y + 0.375)(y + 0.375) = 25.140625

Calculate the square root of the right side: 5.01404278

Break this problem into two subproblems by setting 
(y + 0.375) equal to 5.01404278 and -5.01404278.

Subproblem 1

y + 0.375 = 5.01404278 Simplifying y + 0.375 = 5.01404278 Reorder the terms: 0.375 + y = 5.01404278 Solving 0.375 + y = 5.01404278 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + y = 5.01404278 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + y = 5.01404278 + -0.375 y = 5.01404278 + -0.375 Combine like terms: 5.01404278 + -0.375 = 4.63904278 y = 4.63904278 Simplifying y = 4.63904278

Subproblem 2

y + 0.375 = -5.01404278 Simplifying y + 0.375 = -5.01404278 Reorder the terms: 0.375 + y = -5.01404278 Solving 0.375 + y = -5.01404278 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.375' to each side of the equation. 0.375 + -0.375 + y = -5.01404278 + -0.375 Combine like terms: 0.375 + -0.375 = 0.000 0.000 + y = -5.01404278 + -0.375 y = -5.01404278 + -0.375 Combine like terms: -5.01404278 + -0.375 = -5.38904278 y = -5.38904278 Simplifying y = -5.38904278

Solution

The solution to the problem is based on the solutions from the subproblems. y = {4.63904278, -5.38904278}

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