3.5y+2y^2=1

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Solution for 3.5y+2y^2=1 equation:


Simplifying
3.5y + 2y2 = 1

Solving
3.5y + 2y2 = 1

Solving for variable 'y'.

Reorder the terms:
-1 + 3.5y + 2y2 = 1 + -1

Combine like terms: 1 + -1 = 0
-1 + 3.5y + 2y2 = 0

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

Divide each side by '2'.
-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 = 1.265625
0.765625 + 1.75y + y2 = 1.265625

Factor a perfect square on the left side:
(y + 0.875)(y + 0.875) = 1.265625

Calculate the square root of the right side: 1.125

Break this problem into two subproblems by setting 
(y + 0.875) equal to 1.125 and -1.125.

Subproblem 1

y + 0.875 = 1.125 Simplifying y + 0.875 = 1.125 Reorder the terms: 0.875 + y = 1.125 Solving 0.875 + y = 1.125 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 = 1.125 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = 1.125 + -0.875 y = 1.125 + -0.875 Combine like terms: 1.125 + -0.875 = 0.25 y = 0.25 Simplifying y = 0.25

Subproblem 2

y + 0.875 = -1.125 Simplifying y + 0.875 = -1.125 Reorder the terms: 0.875 + y = -1.125 Solving 0.875 + y = -1.125 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 = -1.125 + -0.875 Combine like terms: 0.875 + -0.875 = 0.000 0.000 + y = -1.125 + -0.875 y = -1.125 + -0.875 Combine like terms: -1.125 + -0.875 = -2 y = -2 Simplifying y = -2

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.25, -2}

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