2h^2+7h+4=0

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Solution for 2h^2+7h+4=0 equation:


Simplifying
2h2 + 7h + 4 = 0

Reorder the terms:
4 + 7h + 2h2 = 0

Solving
4 + 7h + 2h2 = 0

Solving for variable 'h'.

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

Divide each side by '2'.
2 + 3.5h + h2 = 0

Move the constant term to the right:

Add '-2' to each side of the equation.
2 + 3.5h + -2 + h2 = 0 + -2

Reorder the terms:
2 + -2 + 3.5h + h2 = 0 + -2

Combine like terms: 2 + -2 = 0
0 + 3.5h + h2 = 0 + -2
3.5h + h2 = 0 + -2

Combine like terms: 0 + -2 = -2
3.5h + h2 = -2

The h term is 3.5h.  Take half its coefficient (1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
3.5h + 3.0625 + h2 = -2 + 3.0625

Reorder the terms:
3.0625 + 3.5h + h2 = -2 + 3.0625

Combine like terms: -2 + 3.0625 = 1.0625
3.0625 + 3.5h + h2 = 1.0625

Factor a perfect square on the left side:
(h + 1.75)(h + 1.75) = 1.0625

Calculate the square root of the right side: 1.030776406

Break this problem into two subproblems by setting 
(h + 1.75) equal to 1.030776406 and -1.030776406.

Subproblem 1

h + 1.75 = 1.030776406 Simplifying h + 1.75 = 1.030776406 Reorder the terms: 1.75 + h = 1.030776406 Solving 1.75 + h = 1.030776406 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + h = 1.030776406 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + h = 1.030776406 + -1.75 h = 1.030776406 + -1.75 Combine like terms: 1.030776406 + -1.75 = -0.719223594 h = -0.719223594 Simplifying h = -0.719223594

Subproblem 2

h + 1.75 = -1.030776406 Simplifying h + 1.75 = -1.030776406 Reorder the terms: 1.75 + h = -1.030776406 Solving 1.75 + h = -1.030776406 Solving for variable 'h'. Move all terms containing h to the left, all other terms to the right. Add '-1.75' to each side of the equation. 1.75 + -1.75 + h = -1.030776406 + -1.75 Combine like terms: 1.75 + -1.75 = 0.00 0.00 + h = -1.030776406 + -1.75 h = -1.030776406 + -1.75 Combine like terms: -1.030776406 + -1.75 = -2.780776406 h = -2.780776406 Simplifying h = -2.780776406

Solution

The solution to the problem is based on the solutions from the subproblems. h = {-0.719223594, -2.780776406}

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