5a^2-a=35

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Solution for 5a^2-a=35 equation:


Simplifying
5a2 + -1a = 35

Reorder the terms:
-1a + 5a2 = 35

Solving
-1a + 5a2 = 35

Solving for variable 'a'.

Reorder the terms:
-35 + -1a + 5a2 = 35 + -35

Combine like terms: 35 + -35 = 0
-35 + -1a + 5a2 = 0

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

Divide each side by '5'.
-7 + -0.2a + a2 = 0

Move the constant term to the right:

Add '7' to each side of the equation.
-7 + -0.2a + 7 + a2 = 0 + 7

Reorder the terms:
-7 + 7 + -0.2a + a2 = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -0.2a + a2 = 0 + 7
-0.2a + a2 = 0 + 7

Combine like terms: 0 + 7 = 7
-0.2a + a2 = 7

The a term is -0.2a.  Take half its coefficient (-0.1).
Square it (0.01) and add it to both sides.

Add '0.01' to each side of the equation.
-0.2a + 0.01 + a2 = 7 + 0.01

Reorder the terms:
0.01 + -0.2a + a2 = 7 + 0.01

Combine like terms: 7 + 0.01 = 7.01
0.01 + -0.2a + a2 = 7.01

Factor a perfect square on the left side:
(a + -0.1)(a + -0.1) = 7.01

Calculate the square root of the right side: 2.647640459

Break this problem into two subproblems by setting 
(a + -0.1) equal to 2.647640459 and -2.647640459.

Subproblem 1

a + -0.1 = 2.647640459 Simplifying a + -0.1 = 2.647640459 Reorder the terms: -0.1 + a = 2.647640459 Solving -0.1 + a = 2.647640459 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + a = 2.647640459 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + a = 2.647640459 + 0.1 a = 2.647640459 + 0.1 Combine like terms: 2.647640459 + 0.1 = 2.747640459 a = 2.747640459 Simplifying a = 2.747640459

Subproblem 2

a + -0.1 = -2.647640459 Simplifying a + -0.1 = -2.647640459 Reorder the terms: -0.1 + a = -2.647640459 Solving -0.1 + a = -2.647640459 Solving for variable 'a'. Move all terms containing a to the left, all other terms to the right. Add '0.1' to each side of the equation. -0.1 + 0.1 + a = -2.647640459 + 0.1 Combine like terms: -0.1 + 0.1 = 0.0 0.0 + a = -2.647640459 + 0.1 a = -2.647640459 + 0.1 Combine like terms: -2.647640459 + 0.1 = -2.547640459 a = -2.547640459 Simplifying a = -2.547640459

Solution

The solution to the problem is based on the solutions from the subproblems. a = {2.747640459, -2.547640459}

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