6-(4y-7)y=5

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Solution for 6-(4y-7)y=5 equation:


Simplifying
6 + -1(4y + -7) * y = 5

Reorder the terms:
6 + -1(-7 + 4y) * y = 5

Reorder the terms for easier multiplication:
6 + -1y(-7 + 4y) = 5
6 + (-7 * -1y + 4y * -1y) = 5
6 + (7y + -4y2) = 5

Solving
6 + 7y + -4y2 = 5

Solving for variable 'y'.

Reorder the terms:
6 + -5 + 7y + -4y2 = 5 + -5

Combine like terms: 6 + -5 = 1
1 + 7y + -4y2 = 5 + -5

Combine like terms: 5 + -5 = 0
1 + 7y + -4y2 = 0

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

Divide each side by '-4'.
-0.25 + -1.75y + y2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -1.75y + 0.25 + y2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -1.75y + y2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -1.75y + y2 = 0 + 0.25
-1.75y + y2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-1.75y + y2 = 0.25

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 = 0.25 + 0.765625

Reorder the terms:
0.765625 + -1.75y + y2 = 0.25 + 0.765625

Combine like terms: 0.25 + 0.765625 = 1.015625
0.765625 + -1.75y + y2 = 1.015625

Factor a perfect square on the left side:
(y + -0.875)(y + -0.875) = 1.015625

Calculate the square root of the right side: 1.007782219

Break this problem into two subproblems by setting 
(y + -0.875) equal to 1.007782219 and -1.007782219.

Subproblem 1

y + -0.875 = 1.007782219 Simplifying y + -0.875 = 1.007782219 Reorder the terms: -0.875 + y = 1.007782219 Solving -0.875 + y = 1.007782219 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 = 1.007782219 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = 1.007782219 + 0.875 y = 1.007782219 + 0.875 Combine like terms: 1.007782219 + 0.875 = 1.882782219 y = 1.882782219 Simplifying y = 1.882782219

Subproblem 2

y + -0.875 = -1.007782219 Simplifying y + -0.875 = -1.007782219 Reorder the terms: -0.875 + y = -1.007782219 Solving -0.875 + y = -1.007782219 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 = -1.007782219 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = -1.007782219 + 0.875 y = -1.007782219 + 0.875 Combine like terms: -1.007782219 + 0.875 = -0.132782219 y = -0.132782219 Simplifying y = -0.132782219

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.882782219, -0.132782219}

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