-7y=4y^2-3

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Solution for -7y=4y^2-3 equation:


Simplifying
-7y = 4y2 + -3

Reorder the terms:
-7y = -3 + 4y2

Solving
-7y = -3 + 4y2

Solving for variable 'y'.

Reorder the terms:
3 + -7y + -4y2 = -3 + 4y2 + 3 + -4y2

Reorder the terms:
3 + -7y + -4y2 = -3 + 3 + 4y2 + -4y2

Combine like terms: -3 + 3 = 0
3 + -7y + -4y2 = 0 + 4y2 + -4y2
3 + -7y + -4y2 = 4y2 + -4y2

Combine like terms: 4y2 + -4y2 = 0
3 + -7y + -4y2 = 0

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

Divide each side by '-4'.
-0.75 + 1.75y + y2 = 0

Move the constant term to the right:

Add '0.75' to each side of the equation.
-0.75 + 1.75y + 0.75 + y2 = 0 + 0.75

Reorder the terms:
-0.75 + 0.75 + 1.75y + y2 = 0 + 0.75

Combine like terms: -0.75 + 0.75 = 0.00
0.00 + 1.75y + y2 = 0 + 0.75
1.75y + y2 = 0 + 0.75

Combine like terms: 0 + 0.75 = 0.75
1.75y + y2 = 0.75

The y term is 1.75y.  Take half its coefficient (0.875).
Square it (0.765625) and add it to both sides.

Add '0.765625' to each side of the equation.
1.75y + 0.765625 + y2 = 0.75 + 0.765625

Reorder the terms:
0.765625 + 1.75y + y2 = 0.75 + 0.765625

Combine like terms: 0.75 + 0.765625 = 1.515625
0.765625 + 1.75y + y2 = 1.515625

Factor a perfect square on the left side:
(y + 0.875)(y + 0.875) = 1.515625

Calculate the square root of the right side: 1.231107225

Break this problem into two subproblems by setting 
(y + 0.875) equal to 1.231107225 and -1.231107225.

Subproblem 1

y + 0.875 = 1.231107225 Simplifying y + 0.875 = 1.231107225 Reorder the terms: 0.875 + y = 1.231107225 Solving 0.875 + y = 1.231107225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = 1.231107225 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = 1.231107225 + -0.875 y = 1.231107225 + -0.875 Combine like terms: 1.231107225 + -0.875 = 0.356107225 y = 0.356107225 Simplifying y = 0.356107225

Subproblem 2

y + 0.875 = -1.231107225 Simplifying y + 0.875 = -1.231107225 Reorder the terms: 0.875 + y = -1.231107225 Solving 0.875 + y = -1.231107225 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-0.875' to each side of the equation. 0.875 + -0.875 + y = -1.231107225 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = -1.231107225 + -0.875 y = -1.231107225 + -0.875 Combine like terms: -1.231107225 + -0.875 = -2.106107225 y = -2.106107225 Simplifying y = -2.106107225

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.356107225, -2.106107225}

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