4y^2+17y-7=0

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Solution for 4y^2+17y-7=0 equation:


Simplifying
4y2 + 17y + -7 = 0

Reorder the terms:
-7 + 17y + 4y2 = 0

Solving
-7 + 17y + 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'.
-1.75 + 4.25y + y2 = 0

Move the constant term to the right:

Add '1.75' to each side of the equation.
-1.75 + 4.25y + 1.75 + y2 = 0 + 1.75

Reorder the terms:
-1.75 + 1.75 + 4.25y + y2 = 0 + 1.75

Combine like terms: -1.75 + 1.75 = 0.00
0.00 + 4.25y + y2 = 0 + 1.75
4.25y + y2 = 0 + 1.75

Combine like terms: 0 + 1.75 = 1.75
4.25y + y2 = 1.75

The y term is 4.25y.  Take half its coefficient (2.125).
Square it (4.515625) and add it to both sides.

Add '4.515625' to each side of the equation.
4.25y + 4.515625 + y2 = 1.75 + 4.515625

Reorder the terms:
4.515625 + 4.25y + y2 = 1.75 + 4.515625

Combine like terms: 1.75 + 4.515625 = 6.265625
4.515625 + 4.25y + y2 = 6.265625

Factor a perfect square on the left side:
(y + 2.125)(y + 2.125) = 6.265625

Calculate the square root of the right side: 2.503123049

Break this problem into two subproblems by setting 
(y + 2.125) equal to 2.503123049 and -2.503123049.

Subproblem 1

y + 2.125 = 2.503123049 Simplifying y + 2.125 = 2.503123049 Reorder the terms: 2.125 + y = 2.503123049 Solving 2.125 + y = 2.503123049 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.125' to each side of the equation. 2.125 + -2.125 + y = 2.503123049 + -2.125 Combine like terms: 2.125 + -2.125 = 0.000 0.000 + y = 2.503123049 + -2.125 y = 2.503123049 + -2.125 Combine like terms: 2.503123049 + -2.125 = 0.378123049 y = 0.378123049 Simplifying y = 0.378123049

Subproblem 2

y + 2.125 = -2.503123049 Simplifying y + 2.125 = -2.503123049 Reorder the terms: 2.125 + y = -2.503123049 Solving 2.125 + y = -2.503123049 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-2.125' to each side of the equation. 2.125 + -2.125 + y = -2.503123049 + -2.125 Combine like terms: 2.125 + -2.125 = 0.000 0.000 + y = -2.503123049 + -2.125 y = -2.503123049 + -2.125 Combine like terms: -2.503123049 + -2.125 = -4.628123049 y = -4.628123049 Simplifying y = -4.628123049

Solution

The solution to the problem is based on the solutions from the subproblems. y = {0.378123049, -4.628123049}

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