2a^2-9a=350

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Solution for 2a^2-9a=350 equation:


Simplifying
2a2 + -9a = 350

Reorder the terms:
-9a + 2a2 = 350

Solving
-9a + 2a2 = 350

Solving for variable 'a'.

Reorder the terms:
-350 + -9a + 2a2 = 350 + -350

Combine like terms: 350 + -350 = 0
-350 + -9a + 2a2 = 0

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

Divide each side by '2'.
-175 + -4.5a + a2 = 0

Move the constant term to the right:

Add '175' to each side of the equation.
-175 + -4.5a + 175 + a2 = 0 + 175

Reorder the terms:
-175 + 175 + -4.5a + a2 = 0 + 175

Combine like terms: -175 + 175 = 0
0 + -4.5a + a2 = 0 + 175
-4.5a + a2 = 0 + 175

Combine like terms: 0 + 175 = 175
-4.5a + a2 = 175

The a term is -4.5a.  Take half its coefficient (-2.25).
Square it (5.0625) and add it to both sides.

Add '5.0625' to each side of the equation.
-4.5a + 5.0625 + a2 = 175 + 5.0625

Reorder the terms:
5.0625 + -4.5a + a2 = 175 + 5.0625

Combine like terms: 175 + 5.0625 = 180.0625
5.0625 + -4.5a + a2 = 180.0625

Factor a perfect square on the left side:
(a + -2.25)(a + -2.25) = 180.0625

Calculate the square root of the right side: 13.4187369

Break this problem into two subproblems by setting 
(a + -2.25) equal to 13.4187369 and -13.4187369.

Subproblem 1

a + -2.25 = 13.4187369 Simplifying a + -2.25 = 13.4187369 Reorder the terms: -2.25 + a = 13.4187369 Solving -2.25 + a = 13.4187369 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + a = 13.4187369 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + a = 13.4187369 + 2.25 a = 13.4187369 + 2.25 Combine like terms: 13.4187369 + 2.25 = 15.6687369 a = 15.6687369 Simplifying a = 15.6687369

Subproblem 2

a + -2.25 = -13.4187369 Simplifying a + -2.25 = -13.4187369 Reorder the terms: -2.25 + a = -13.4187369 Solving -2.25 + a = -13.4187369 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '2.25' to each side of the equation. -2.25 + 2.25 + a = -13.4187369 + 2.25 Combine like terms: -2.25 + 2.25 = 0.00 0.00 + a = -13.4187369 + 2.25 a = -13.4187369 + 2.25 Combine like terms: -13.4187369 + 2.25 = -11.1687369 a = -11.1687369 Simplifying a = -11.1687369

Solution

The solution to the problem is based on the solutions from the subproblems. a = {15.6687369, -11.1687369}

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