4y^2+11y+7=5

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Solution for 4y^2+11y+7=5 equation:


Simplifying
4y2 + 11y + 7 = 5

Reorder the terms:
7 + 11y + 4y2 = 5

Solving
7 + 11y + 4y2 = 5

Solving for variable 'y'.

Reorder the terms:
7 + -5 + 11y + 4y2 = 5 + -5

Combine like terms: 7 + -5 = 2
2 + 11y + 4y2 = 5 + -5

Combine like terms: 5 + -5 = 0
2 + 11y + 4y2 = 0

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

Divide each side by '4'.
0.5 + 2.75y + y2 = 0

Move the constant term to the right:

Add '-0.5' to each side of the equation.
0.5 + 2.75y + -0.5 + y2 = 0 + -0.5

Reorder the terms:
0.5 + -0.5 + 2.75y + y2 = 0 + -0.5

Combine like terms: 0.5 + -0.5 = 0.0
0.0 + 2.75y + y2 = 0 + -0.5
2.75y + y2 = 0 + -0.5

Combine like terms: 0 + -0.5 = -0.5
2.75y + y2 = -0.5

The y term is 2.75y.  Take half its coefficient (1.375).
Square it (1.890625) and add it to both sides.

Add '1.890625' to each side of the equation.
2.75y + 1.890625 + y2 = -0.5 + 1.890625

Reorder the terms:
1.890625 + 2.75y + y2 = -0.5 + 1.890625

Combine like terms: -0.5 + 1.890625 = 1.390625
1.890625 + 2.75y + y2 = 1.390625

Factor a perfect square on the left side:
(y + 1.375)(y + 1.375) = 1.390625

Calculate the square root of the right side: 1.179247642

Break this problem into two subproblems by setting 
(y + 1.375) equal to 1.179247642 and -1.179247642.

Subproblem 1

y + 1.375 = 1.179247642 Simplifying y + 1.375 = 1.179247642 Reorder the terms: 1.375 + y = 1.179247642 Solving 1.375 + y = 1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + y = 1.179247642 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + y = 1.179247642 + -1.375 y = 1.179247642 + -1.375 Combine like terms: 1.179247642 + -1.375 = -0.195752358 y = -0.195752358 Simplifying y = -0.195752358

Subproblem 2

y + 1.375 = -1.179247642 Simplifying y + 1.375 = -1.179247642 Reorder the terms: 1.375 + y = -1.179247642 Solving 1.375 + y = -1.179247642 Solving for variable 'y'. Move all terms containing y to the left, all other terms to the right. Add '-1.375' to each side of the equation. 1.375 + -1.375 + y = -1.179247642 + -1.375 Combine like terms: 1.375 + -1.375 = 0.000 0.000 + y = -1.179247642 + -1.375 y = -1.179247642 + -1.375 Combine like terms: -1.179247642 + -1.375 = -2.554247642 y = -2.554247642 Simplifying y = -2.554247642

Solution

The solution to the problem is based on the solutions from the subproblems. y = {-0.195752358, -2.554247642}

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