5a^2+17a-49=0

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Solution for 5a^2+17a-49=0 equation:


Simplifying
5a2 + 17a + -49 = 0

Reorder the terms:
-49 + 17a + 5a2 = 0

Solving
-49 + 17a + 5a2 = 0

Solving for variable 'a'.

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

Divide each side by '5'.
-9.8 + 3.4a + a2 = 0

Move the constant term to the right:

Add '9.8' to each side of the equation.
-9.8 + 3.4a + 9.8 + a2 = 0 + 9.8

Reorder the terms:
-9.8 + 9.8 + 3.4a + a2 = 0 + 9.8

Combine like terms: -9.8 + 9.8 = 0.0
0.0 + 3.4a + a2 = 0 + 9.8
3.4a + a2 = 0 + 9.8

Combine like terms: 0 + 9.8 = 9.8
3.4a + a2 = 9.8

The a term is 3.4a.  Take half its coefficient (1.7).
Square it (2.89) and add it to both sides.

Add '2.89' to each side of the equation.
3.4a + 2.89 + a2 = 9.8 + 2.89

Reorder the terms:
2.89 + 3.4a + a2 = 9.8 + 2.89

Combine like terms: 9.8 + 2.89 = 12.69
2.89 + 3.4a + a2 = 12.69

Factor a perfect square on the left side:
(a + 1.7)(a + 1.7) = 12.69

Calculate the square root of the right side: 3.562302626

Break this problem into two subproblems by setting 
(a + 1.7) equal to 3.562302626 and -3.562302626.

Subproblem 1

a + 1.7 = 3.562302626 Simplifying a + 1.7 = 3.562302626 Reorder the terms: 1.7 + a = 3.562302626 Solving 1.7 + a = 3.562302626 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + a = 3.562302626 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + a = 3.562302626 + -1.7 a = 3.562302626 + -1.7 Combine like terms: 3.562302626 + -1.7 = 1.862302626 a = 1.862302626 Simplifying a = 1.862302626

Subproblem 2

a + 1.7 = -3.562302626 Simplifying a + 1.7 = -3.562302626 Reorder the terms: 1.7 + a = -3.562302626 Solving 1.7 + a = -3.562302626 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '-1.7' to each side of the equation. 1.7 + -1.7 + a = -3.562302626 + -1.7 Combine like terms: 1.7 + -1.7 = 0.0 0.0 + a = -3.562302626 + -1.7 a = -3.562302626 + -1.7 Combine like terms: -3.562302626 + -1.7 = -5.262302626 a = -5.262302626 Simplifying a = -5.262302626

Solution

The solution to the problem is based on the solutions from the subproblems. a = {1.862302626, -5.262302626}

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