-1=4y^2-7y+1

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Solution for -1=4y^2-7y+1 equation:


Simplifying
-1 = 4y2 + -7y + 1

Reorder the terms:
-1 = 1 + -7y + 4y2

Solving
-1 = 1 + -7y + 4y2

Solving for variable 'y'.

Combine like terms: -1 + -1 = -2
-2 + 7y + -4y2 = 1 + -7y + 4y2 + -1 + 7y + -4y2

Reorder the terms:
-2 + 7y + -4y2 = 1 + -1 + -7y + 7y + 4y2 + -4y2

Combine like terms: 1 + -1 = 0
-2 + 7y + -4y2 = 0 + -7y + 7y + 4y2 + -4y2
-2 + 7y + -4y2 = -7y + 7y + 4y2 + -4y2

Combine like terms: -7y + 7y = 0
-2 + 7y + -4y2 = 0 + 4y2 + -4y2
-2 + 7y + -4y2 = 4y2 + -4y2

Combine like terms: 4y2 + -4y2 = 0
-2 + 7y + -4y2 = 0

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

Divide each side by '-4'.
0.5 + -1.75y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + -1.75y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + -1.75y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + -1.75y + y2 = 0 + -0.5
-1.75y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
-1.75y + y2 = -0.5

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 = -0.5 + 0.765625

Reorder the terms:
0.765625 + -1.75y + y2 = -0.5 + 0.765625

Combine like terms: -0.5 + 0.765625 = 0.265625
0.765625 + -1.75y + y2 = 0.265625

Factor a perfect square on the left side:
(y + -0.875)(y + -0.875) = 0.265625

Calculate the square root of the right side: 0.515388203

Break this problem into two subproblems by setting 
(y + -0.875) equal to 0.515388203 and -0.515388203.

Subproblem 1

y + -0.875 = 0.515388203 Simplifying y + -0.875 = 0.515388203 Reorder the terms: -0.875 + y = 0.515388203 Solving -0.875 + y = 0.515388203 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 = 0.515388203 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = 0.515388203 + 0.875 y = 0.515388203 + 0.875 Combine like terms: 0.515388203 + 0.875 = 1.390388203 y = 1.390388203 Simplifying y = 1.390388203

Subproblem 2

y + -0.875 = -0.515388203 Simplifying y + -0.875 = -0.515388203 Reorder the terms: -0.875 + y = -0.515388203 Solving -0.875 + y = -0.515388203 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 = -0.515388203 + 0.875 Combine like terms: -0.875 + 0.875 = 0.000 0.000 + y = -0.515388203 + 0.875 y = -0.515388203 + 0.875 Combine like terms: -0.515388203 + 0.875 = 0.359611797 y = 0.359611797 Simplifying y = 0.359611797

Solution

The solution to the problem is based on the solutions from the subproblems. y = {1.390388203, 0.359611797}

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